diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..44fcab8
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.ipynb filter=nbstripout
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4c07589
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+.idea
++.DS_Store*
+.pytest_cache
+__pycache__/
+*.rb
+.vscode
+CACHEDIR.TAG
+.venv/
\ No newline at end of file
diff --git a/assignment1/assignment1-test.py b/assignment1/assignment1-test.py
new file mode 100644
index 0000000..9333a2e
--- /dev/null
+++ b/assignment1/assignment1-test.py
@@ -0,0 +1,59 @@
+import assignment1 as a1
+
+def test_hello():
+    assert a1.hello() == "Hello!"
+
+def test_greet():
+    assert a1.greet("James") == "Hello, James!"
+
+def test_calc():
+    assert a1.calc(5,6) == 30
+    assert a1.calc(5,6,"add") == 11
+    assert a1.calc(20,5,"divide") == 4
+    assert a1.calc(14,2.0,"multiply") == 28.0
+    assert a1.calc(12.6, 4.4, "subtract") == 8.2
+    assert a1.calc(9,5, "modulo") == 4
+    assert a1.calc(10,0,"divide") == "You can't divide by 0!"
+    assert a1.calc("first", "second", "multiply") == "You can't multiply those values!"
+
+def test_data_type_conversion():
+    result = a1.data_type_conversion("110", "int")
+    assert type(result).__name__ == "int"
+    assert result == 110
+    result = a1.data_type_conversion("5.5", "float")
+    assert type(result).__name__ == "float"
+    assert result == 5.5
+    result = a1.data_type_conversion(7,"float")
+    assert type(result).__name__ == "float"
+    assert result == 7.0
+    result = a1.data_type_conversion(91.1,"str")
+    assert type(result).__name__ == "str"
+    assert result == "91.1"
+    assert a1.data_type_conversion("banana", "int") == "You can't convert banana into a int."
+
+def test_grade():
+    assert a1.grade(75,85,95) == "B"
+    assert a1.grade("three", "blind", "mice") == "Invalid data was provided."
+
+def test_repeat():
+    assert a1.repeat("up,", 4) == "up,up,up,up,"
+
+def test_student_scores():
+    assert a1.student_scores("mean", Tom=75, Dick=89, Angela=91) == (75 + 89 + 91) / 3
+    assert a1.student_scores("best", Tom=75, Dick=89, Angela=91, Frank=50 ) == "Angela"
+
+def test_titleize():
+    assert a1.titleize("war and peace") == "War and Peace"
+    assert a1.titleize("a separate peace") == "A Separate Peace"
+    assert a1.titleize("after on") == "After On"
+
+def test_hangman():
+    assert a1.hangman("difficulty","ic") == "_i__ic____"
+
+def test_pig_latin():
+    assert a1.pig_latin("apple") == "appleay"
+    assert a1.pig_latin("banana") == "ananabay"
+    assert a1.pig_latin("cherry") == "errychay"
+    assert a1.pig_latin("quiet") == "ietquay"
+    assert a1.pig_latin("square") == "aresquay"
+    assert a1.pig_latin("the quick brown fox") == "ethay ickquay ownbray oxfay"
\ No newline at end of file
diff --git a/assignment1/assignment1.py b/assignment1/assignment1.py
new file mode 100644
index 0000000..fafa187
--- /dev/null
+++ b/assignment1/assignment1.py
@@ -0,0 +1 @@
+# Write your code here.
\ No newline at end of file
diff --git a/assignment10/.keep b/assignment10/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/assignment2/assignment2-test.py b/assignment2/assignment2-test.py
new file mode 100644
index 0000000..68560d8
--- /dev/null
+++ b/assignment2/assignment2-test.py
@@ -0,0 +1,73 @@
+import assignment2 as a2
+import os
+
+def test_read_employees():
+    employees = a2.read_employees()
+    assert employees != None
+    assert a2.employees != None
+    assert len(a2.employees["fields"]) == 4
+    assert a2.employees["fields"][1] == "first_name"
+    assert len(a2.employees["rows"]) == 20
+
+def test_column_name():
+    assert a2.column_index("last_name") == 2
+    assert a2.employee_id_column != None
+
+def test_first_name():
+    assert a2.first_name(2) in ("David","Lauren") # values before and after sort
+
+def test_employee_find():
+    match = a2.employee_find(3)
+    assert match[0][0] == "3"
+    assert len(match[0]) == 4
+
+def test_employee_find_2():
+    match = a2.employee_find_2(4)
+    assert match[0][0] == "4"
+    assert len(match[0]) == 4
+
+def test_sort_by_last_name():
+    rows = a2.sort_by_last_name()
+    assert len(rows) == 20
+    assert rows[0][2]== "Bowman"
+
+def test_employee_dict():
+    dict_result = a2.employee_dict(a2.employees["rows"][0])
+    assert dict_result["last_name"] == "Bowman"
+    assert "employee_id" not in dict_result.keys()
+
+def test_all_employees_dict():
+    dict_result = a2.all_employees_dict()
+    assert len(dict_result.keys()) == 20
+    assert dict_result["9"]["first_name"] == "Phillip"
+
+def test_get_this_value():
+    assert a2.get_this_value() == "ABC"
+
+def test_set_that_secret():
+    import custom_module
+    a2.set_that_secret("swordfish")
+    assert custom_module.secret == "swordfish"
+
+def test_read_minutes():
+    d1, d2 = a2.read_minutes()
+    assert d1["rows"][1] == ("Tony Henderson","November 15, 1991")
+    assert d2["rows"][2] == ("Sarah Murray","November 19, 1988")
+    assert a2.minutes1 != None
+
+def test_create_minutes_set():
+    minutes_set = a2.create_minutes_set()
+    assert type(minutes_set).__name__ == "set"
+    assert len(minutes_set) == 46
+    assert a2.minutes_set != None
+
+def test_create_minutes_list():
+    minutes_list = a2.create_minutes_list()
+    assert type(minutes_list[0][1]).__name__ == "datetime"
+    assert type(minutes_list[0]).__name__ == "tuple"
+    assert a2.minutes_list != None
+
+def test_write_sorted_list():
+    sorted_list = a2.write_sorted_list()
+    assert sorted_list[0] == ("Jason Tucker","September 20, 1980")
+    assert os.access("./minutes.csv", os.F_OK) == True
\ No newline at end of file
diff --git a/assignment2/minutes.csv b/assignment2/minutes.csv
new file mode 100644
index 0000000..0acabb7
--- /dev/null
+++ b/assignment2/minutes.csv
@@ -0,0 +1,47 @@
+Name,Date
+Jason Tucker,"September 20, 1980"
+Austin Hester,"March 8, 1981"
+Daniel Jackson,"October 2, 1981"
+Mrs. Samantha Johnson,"December 17, 1981"
+Joseph Harris,"March 3, 1982"
+Mrs. Samantha Johnson,"March 12, 1982"
+Gina Maldonado,"December 16, 1982"
+Mrs. Samantha Johnson,"December 23, 1982"
+Yesenia Smith,"August 10, 1983"
+Lori Martin,"February 5, 1984"
+Jonathan Parrish,"June 12, 1984"
+Mrs. Samantha Johnson,"July 20, 1984"
+Amanda Brown,"August 8, 1984"
+Sarah Murray,"October 30, 1984"
+Mrs. Samantha Johnson,"November 28, 1984"
+Austin Hester,"June 4, 1985"
+Jonathan Parrish,"March 18, 1986"
+Yesenia Smith,"May 6, 1986"
+Daniel Jackson,"December 13, 1986"
+Gina Maldonado,"February 13, 1987"
+Kimberly Stewart,"December 12, 1987"
+Mrs. Samantha Johnson,"July 10, 1988"
+Sarah Murray,"August 16, 1988"
+Aaron Kaufman,"October 24, 1988"
+Tony Henderson,"November 7, 1988"
+Sarah Murray,"November 19, 1988"
+Austin Hester,"January 18, 1989"
+Joseph Harris,"March 1, 1989"
+Gina Maldonado,"April 7, 1989"
+Aaron Kaufman,"November 14, 1989"
+Daniel Jackson,"April 8, 1990"
+Aaron Kaufman,"May 1, 1990"
+Aaron Kaufman,"July 21, 1990"
+Tony Henderson,"October 4, 1990"
+Yesenia Smith,"November 23, 1990"
+Joseph Harris,"April 3, 1991"
+Jason Tucker,"April 30, 1991"
+Matthew Russell,"May 31, 1991"
+Lori Martin,"July 8, 1991"
+Mrs. Samantha Johnson,"July 23, 1991"
+Tony Henderson,"November 15, 1991"
+Gina Maldonado,"February 9, 1992"
+Sarah Murray,"June 27, 1992"
+Gina Maldonado,"October 31, 1992"
+Austin Hester,"December 10, 1992"
+Mrs. Samantha Johnson,"December 12, 1992"
diff --git a/assignment3/.keep b/assignment3/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/assignment3/decorator.log b/assignment3/decorator.log
new file mode 100644
index 0000000..3a29aee
--- /dev/null
+++ b/assignment3/decorator.log
@@ -0,0 +1,15 @@
+function: task_1a
+positional parameters: none
+keyword parameters: none
+return: None
+
+function: task_1b
+positional parameters: [10, 20]
+keyword parameters: none
+return: True
+
+function: task_1c
+positional parameters: none
+keyword parameters: {'user': 'Ricardo', 'status': 'Student'}
+return: logger_decorator
+
diff --git a/assignment3/developer-class.py b/assignment3/developer-class.py
new file mode 100644
index 0000000..746ed2a
--- /dev/null
+++ b/assignment3/developer-class.py
@@ -0,0 +1,15 @@
+class Employee:
+    def __init__(self, first, last, salary):
+        self.first = first
+        self.last = last
+        self.salary = float(salary)
+
+class Developer(Employee):
+    def __init__(self, first, last, salary, prog_lang):
+        super().__init__(first, last, salary)
+        self.prog_lang = prog_lang
+
+dev_1 = Developer("Ricardo", "Santiz", 60000, "Python")
+print(f"Name: {dev_1.first} {dev_1.last}")
+print(f"Language: {dev_1.prog_lang}")
+print(f"Salary: {dev_1.salary}")
\ No newline at end of file
diff --git a/assignment3/employee-class.py b/assignment3/employee-class.py
new file mode 100644
index 0000000..aa48b5d
--- /dev/null
+++ b/assignment3/employee-class.py
@@ -0,0 +1,16 @@
+
+class Employee:
+    def __init__(self, first, last, salary):
+        self.first = first
+        self.last = last
+        self.salary = float(salary)
+        self.email = f"{first.lower()}.{last.lower()}@company.com"
+
+    def give_raise(self, amount):
+        self.salary += amount
+
+emp_1 = Employee("Ricardo", "Santiz", 50000)
+print(emp_1.email)
+print(f"Old Salary: {emp_1.salary}")
+emp_1.give_raise(5555)
+print(f"New Salary: {emp_1.salary}")
diff --git a/assignment3/hangman-closure.py b/assignment3/hangman-closure.py
new file mode 100644
index 0000000..4577aca
--- /dev/null
+++ b/assignment3/hangman-closure.py
@@ -0,0 +1,25 @@
+def hangman_game(word):
+    word = word.lower()
+    guessed_letters = []
+
+    def guess(letter):
+        letter = letter.lower()
+        if letter in guessed_letters:
+            return f"You already guessed '{letter}'."
+        
+        guessed_letters.append(letter)
+        
+        display_word = [char if char in guessed_letters else "_" for char in word]
+        
+        if letter in word:
+            return f"Correct! {' '.join(display_word)}"
+        else:
+            return f"Incorrect. {' '.join(display_word)}"
+            
+    return guess
+
+play = hangman_game("Python")
+print(play("p"))
+print(play("y"))
+print(play("z"))
+print(play("p"))
diff --git a/assignment3/list-comprehensions.py b/assignment3/list-comprehensions.py
new file mode 100644
index 0000000..29dd0da
--- /dev/null
+++ b/assignment3/list-comprehensions.py
@@ -0,0 +1,12 @@
+import csv
+
+with open('csv/employees.csv', 'r') as file:
+    reader = csv.reader(file)
+    data = list(reader)
+    
+
+full_names = [f"{row[0]} {row[1]}" for row in data[1:]]
+print(full_names)
+
+names_with_e = [name for name in full_names if 'e' in name.lower()]
+print(names_with_e)
\ No newline at end of file
diff --git a/assignment3/log-decorator.py b/assignment3/log-decorator.py
new file mode 100644
index 0000000..dd5b90a
--- /dev/null
+++ b/assignment3/log-decorator.py
@@ -0,0 +1,34 @@
+import logging
+logger = logging.getLogger(__name__ + "_parameter_log")
+logger.setLevel(logging.INFO)
+logger.addHandler(logging.FileHandler("./assignment3/decorator.log","a"))
+
+def logger_decorator(func):
+    def wrapper(*args, **kwargs):
+        pos_params = list(args) if args else "none"
+        kw_params = kwargs if kwargs else "none"
+        result = func(*args, **kwargs)
+        
+        log_msg = (f"function: {func.__name__}\n"
+                   f"positional parameters: {pos_params}\n"
+                   f"keyword parameters: {kw_params}\n"
+                   f"return: {result}\n")
+        logger.info(log_msg)
+        return result
+    return wrapper
+
+@logger_decorator
+def task_1a():
+    print("Hello, World!")
+
+@logger_decorator
+def task_1b(*args):
+    return True
+
+@logger_decorator
+def task_1c(**kwargs):
+    return "logger_decorator"
+
+task_1a()
+task_1b(10, 20)
+task_1c(user="Ricardo", status="Student")
diff --git a/assignment3/type-decorator.py b/assignment3/type-decorator.py
new file mode 100644
index 0000000..8c14d41
--- /dev/null
+++ b/assignment3/type-decorator.py
@@ -0,0 +1,21 @@
+def type_converter(type_of_output):
+    def decorator(func):
+        def wrapper(*args, **kwargs):
+            value = func(*args, **kwargs)
+            return type_of_output(value)
+        return wrapper
+    return decorator
+
+@type_converter(str)
+def return_int():
+    return 5
+
+@type_converter(int)
+def return_string_num():
+    return "123"
+
+string_five = return_int()
+int_one_two_three = return_string_num()
+
+print(f"Value: {string_five}, Type: {type(string_five).__name__}")
+print(f"Value: {int_one_two_three}, Type: {type(int_one_two_three).__name__}")
diff --git a/assignment4/assignment4-test.py b/assignment4/assignment4-test.py
new file mode 100644
index 0000000..3ad40a9
--- /dev/null
+++ b/assignment4/assignment4-test.py
@@ -0,0 +1,133 @@
+import assignment4 as a4
+import numpy as np
+import pandas as pd
+import os
+
+test1_df = pd.DataFrame({   'Name': ['Alice', 'Bob', 'Charlie'], 
+                            'Age': [25, 30, 35], 
+                            'City': ['New York', 'Los Angeles', 'Chicago']})
+
+# Task 1
+def test_data_frame_from_dictionary():
+    assert test1_df.equals(a4.task1_data_frame)
+
+def test_added_column():
+    assert a4.task1_with_salary['Salary'].equals(pd.Series([70000, 80000, 90000]))
+
+def test_increment_column():
+    assert a4.task1_older["Age"].equals(pd.Series([26, 31, 36]))
+
+def test_write_csv():
+    assert os.access("./employees.csv", os.F_OK) == True
+    # make sure there is no index
+    assert pd.read_csv('employees.csv').shape == (3, 4)
+    
+
+
+# Task 2
+def test_read_data_frame_from_csv():
+    assert a4.task1_older.equals(a4.task2_employees)
+
+test2_json_df = pd.DataFrame({ 'Name': ['Eve', 'Frank'],
+                                'Age': [28, 40],
+                                'City': ['Miami', 'Seattle'],
+                                'Salary': [60000, 95000]})
+
+def test_read_data_frame_from_json():
+    assert os.access("./additional_employees.json", os.F_OK) == True
+    assert a4.json_employees.equals(test2_json_df)
+
+def test_concat_json_employees():
+    assert a4.more_employees.equals(pd.concat([a4.task2_employees, a4.json_employees], ignore_index=True))
+    assert a4.more_employees.shape == (5, 4)
+
+
+# Task 3
+def test_head():
+    assert a4.first_three.equals(a4.more_employees.head(3))
+
+def test_tail():
+    assert a4.last_two.equals(a4.more_employees.tail(2))
+
+def test_shape():
+    assert a4.employee_shape == (5, 4)
+
+
+# Task 4
+from io import StringIO
+sample_data = """Name,Age,Salary,Hire Date,Department
+Alice, 29,50000,2021/01/15, Sales 
+Bob, 32, unknown,2020-03-18,MARKETING
+ charlie, NaN, 70000,3/25/2019,marketinG
+Dana, 41, n/a,2020/12/01, HR
+Eve, 24,65000,2021/06/07,  hr
+Frank, 32,75000, 2019-07-11,Sales
+Bob, 32, unknown,2020-03-18,MARKETING
+"""
+# Read into DataFrame
+ddf = pd.read_csv(StringIO(sample_data))
+tdf = ddf.copy()
+
+# Perform the same cleaning steps
+tdf.drop_duplicates(inplace=True)
+tdf['Age'] = pd.to_numeric(tdf['Age'], errors='coerce')
+tdf['Salary'] = tdf['Salary'].replace(['unknown', 'n/a'], pd.NA)
+tdf['Salary'] = pd.to_numeric(tdf['Salary'], errors='coerce')
+tdf['Hire Date'] = pd.to_datetime(tdf['Hire Date'], errors='coerce')
+tdf['Name'] = tdf['Name'].str.strip()
+tdf['Department'] = tdf['Department'].str.strip().str.upper()
+
+def test_dirty_data_read():
+    assert a4.dirty_data.equals(ddf)
+
+def test_no_duplicate_rows():
+    assert len(a4.clean_data) == 6
+
+def test_age_numeric():
+    assert pd.api.types.is_numeric_dtype(a4.clean_data['Age'])
+    assert a4.clean_data['Age'].dropna().between(1, 100).all()
+
+def test_salary_numeric():
+    assert pd.api.types.is_numeric_dtype(a4.clean_data['Salary'])
+
+def test_no_missing_age_or_salary():
+    assert not a4.clean_data['Age'].isnull().any() 
+    assert not a4.clean_data['Salary'].isnull().any()
+
+def test_hire_date_datetime():
+    assert pd.api.types.is_datetime64_any_dtype(a4.clean_data['Hire Date'])
+
+def test_department_uppercase():
+    all_upper = True
+    for dept in a4.clean_data['Department']:
+        if not dept.isupper():
+            all_upper = False
+    assert all_upper
+
+# April 2: If dates are not converted properly with form="mixed" will end up with NaTs
+def test_hire_date_notNAT():
+    nat_count = a4.clean_data['Hire Date'].isna().sum()
+    assert nat_count == 0
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/assignment4/assignment4.py b/assignment4/assignment4.py
new file mode 100644
index 0000000..e69de29
diff --git a/assignment4/dirty_data.csv b/assignment4/dirty_data.csv
new file mode 100644
index 0000000..0eb86b4
--- /dev/null
+++ b/assignment4/dirty_data.csv
@@ -0,0 +1,8 @@
+Name,Age,Salary,Hire Date,Department
+Alice, 29,50000,2021/01/15, Sales 
+Bob, 32, unknown,2020-03-18,MARKETING
+ charlie, NaN, 70000,3/25/2019,marketinG
+Dana, 41, n/a,2020/12/01, HR
+Eve, 24,65000,2021/06/07,  hr
+Frank, 32,75000, 2019-07-11,Sales
+Bob, 32, unknown,2020-03-18,MARKETING
diff --git a/assignment8/.keep b/assignment8/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/assignment9/.keep b/assignment9/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/assignment9/order_summary.csv b/assignment9/order_summary.csv
new file mode 100644
index 0000000..39eec4a
--- /dev/null
+++ b/assignment9/order_summary.csv
@@ -0,0 +1,60 @@
+product_id,line_item_count,total_paid,product_name
+59,14,1385.8,Ball
+23,12,16.56,Bike
+55,19,818.12,Chair
+8,12,186.88,Concrete Cheese
+28,12,633.81,Concrete Gloves
+34,19,1942.56,Concrete Pants
+40,21,1285.05,Cotton Ball
+6,26,2168.4,Cotton Bike
+10,30,3263.7000000000003,Cotton Sausages
+53,21,1282.56,Ergonomic Cheese
+4,21,2058.71,Ergonomic Wooden Soap
+50,18,2330.37,Fantastic Fish
+17,19,1458.0,Fantastic Sausages
+1,21,506.25,Fantastic Shoes
+29,21,2213.14,For repair Fresh Fish
+2,28,1780.17,For repair Soft Table
+37,21,555.9599999999999,Frozen Computer
+16,12,1211.55,Gorgeous Salad
+14,19,720.65,Handcrafted Hat
+45,22,1968.9999999999998,Handcrafted Wooden Fish
+19,17,1335.56,Hat
+25,20,378.24,Incredible Hat
+58,17,1499.5500000000002,Intelligent Chips
+20,22,982.5000000000001,Licensed Cheese
+54,21,2362.2000000000003,Licensed Plastic Bike
+42,14,1400.0800000000002,Mouse
+12,19,1348.2,Mouse
+57,20,1306.3700000000001,New Fresh Chips
+51,18,1651.63,Pants
+24,20,1290.9,Plastic Pants
+35,15,1633.5500000000002,Practical Fish
+41,14,588.19,Practical Steel Towels
+44,18,224.0,Practical Tuna
+56,16,1045.8,Refined Ball
+30,14,483.84,Refined Cotton Sausages
+48,16,1499.35,Rubber Mouse
+52,19,1052.56,Rubber Towels
+43,15,76.85000000000001,Salad
+3,19,986.44,Sausages
+46,15,560.9200000000001,Sausages
+18,13,25.300000000000004,Shirt
+11,23,1896.58,Shoes
+36,21,878.08,Sleek Concrete Cheese
+7,18,2067.87,Sleek Granite Car
+15,30,438.18,Small Fish
+22,17,1069.17,Small Shirt
+13,19,352.95,Soft Pizza
+21,18,1799.28,Steel Car
+33,10,734.58,Steel Computer
+31,23,264.12,Steel Mouse
+49,17,1348.1999999999998,Steel Sausages
+27,17,453.9,Table
+32,19,850.75,Tasty Pizza
+47,13,1535.7600000000002,Tuna
+26,24,1433.7,Unbranded Chicken
+39,13,992.1600000000001,Unbranded Wooden Hat
+9,22,211.64999999999998,Unbranded Wooden Keyboard
+38,18,952.5600000000001,Wooden Mouse
+5,20,1767.3000000000002,Wooden Shoes
diff --git a/assignment9/sql_intro.py b/assignment9/sql_intro.py
new file mode 100644
index 0000000..64b9fc9
--- /dev/null
+++ b/assignment9/sql_intro.py
@@ -0,0 +1,145 @@
+import sqlite3
+
+def add_publisher(cursor, name):
+    try:
+        cursor.execute("INSERT INTO publishers (name) VALUES (?)", (name,))
+    except sqlite3.IntegrityError:
+        print(f"{name} is already in the database.")
+
+
+def add_magazine(cursor, name, publisher_id):
+    try:
+        cursor.execute(
+            "INSERT INTO magazines (name, publisher_id) VALUES (?, ?)",
+            (name, publisher_id)
+        )
+    except sqlite3.IntegrityError:
+        print(f"{name} is already in the database.")
+
+
+def add_subscriber(cursor, name, address):
+    try:
+        cursor.execute(
+            "SELECT * FROM subscribers WHERE name = ? AND address = ?",
+            (name, address)
+        )
+        results = cursor.fetchall()
+
+        if len(results) > 0:
+            print(f"{name} at {address} is already in the database.")
+            return
+
+        cursor.execute(
+            "INSERT INTO subscribers (name, address) VALUES (?, ?)",
+            (name, address)
+        )
+    except sqlite3.Error as e:
+        print("Database error:", e)
+
+def add_subscription(cursor, subscriber_id, magazine_id, expiration_date):
+    try:
+        cursor.execute(
+            "SELECT * FROM subscriptions WHERE subscriber_id = ? AND magazine_id = ?",
+            (subscriber_id, magazine_id)
+        )
+        results = cursor.fetchall()
+
+        if len(results) > 0:
+            print(f"Subscription already exists for subscriber {subscriber_id} and magazine {magazine_id}.")
+            return
+
+        cursor.execute(
+            "INSERT INTO subscriptions (subscriber_id, magazine_id, expiration_date) VALUES (?, ?, ?)",
+            (subscriber_id, magazine_id, expiration_date)
+        )
+    except sqlite3.Error as e:
+        print("Database error:", e)
+
+try:
+    with sqlite3.connect("../db/magazines.db") as conn:
+        conn.execute("PRAGMA foreign_keys = 1")
+
+        cursor = conn.cursor()
+
+# Create publishers table
+        cursor.execute("""
+        CREATE TABLE IF NOT EXISTS publishers (
+            publisher_id INTEGER PRIMARY KEY,
+            name TEXT UNIQUE NOT NULL
+        )
+        """)
+# Create magazines table
+        cursor.execute("""
+        CREATE TABLE IF NOT EXISTS magazines (
+            magazine_id INTEGER PRIMARY KEY,
+            name TEXT UNIQUE NOT NULL,
+            publisher_id INTEGER NOT NULL,
+            FOREIGN KEY (publisher_id) REFERENCES publishers(publisher_id)
+        )
+        """)
+# Create subscribers table
+        cursor.execute("""
+        CREATE TABLE IF NOT EXISTS subscribers (
+            subscriber_id INTEGER PRIMARY KEY,
+            name TEXT NOT NULL,
+            address TEXT NOT NULL
+        )
+        """)
+# Create subscription table
+        cursor.execute("""
+        CREATE TABLE IF NOT EXISTS subscriptions (
+            subscription_id INTEGER PRIMARY KEY,
+            subscriber_id INTEGER NOT NULL,
+            magazine_id INTEGER NOT NULL,
+            expiration_date TEXT NOT NULL,
+            FOREIGN KEY (subscriber_id) REFERENCES subscribers(subscriber_id),
+            FOREIGN KEY (magazine_id) REFERENCES magazines(magazine_id)
+        )
+        """)
+
+        add_publisher(cursor, "Time")
+        add_publisher(cursor, "National Geographic")
+        add_publisher(cursor, "Condé Nast")
+
+        add_magazine(cursor, "Time Magazine", 1)
+        add_magazine(cursor, "National Geographic", 2)
+        add_magazine(cursor, "The New Yorker", 3)
+
+        add_subscriber(cursor, "Ricardo Santiz", "100 Main Street")
+        add_subscriber(cursor, "Maria Lopez", "200 Oak Avenue")
+        add_subscriber(cursor, "John Smith", "300 Pine Road")
+
+        add_subscription(cursor, 1, 1, "2026-12-31")
+        add_subscription(cursor, 1, 2, "2026-11-30")
+        add_subscription(cursor, 2, 3, "2026-10-31")
+        add_subscription(cursor, 3, 1, "2026-09-30")
+
+        print("\nPublishers:")
+        cursor.execute("SELECT * FROM publishers")
+        for row in cursor.fetchall():
+            print(row)
+      
+        print("\nMagazines sorted by name:")
+        cursor.execute("SELECT * FROM magazines ORDER BY name")
+
+        for row in cursor.fetchall():
+            print(row)
+
+        print("\nMagazines by publisher:")
+
+        cursor.execute("""
+        SELECT magazines.name, publishers.name
+        FROM magazines
+        JOIN publishers ON magazines.publisher_id
+         = publishers.publisher_id
+        WHERE publishers.name = "Time"
+        """)
+        for row in cursor.fetchall():
+            print(row)
+    
+        conn.commit()
+        print("Connected to magazines.db")
+        print("Tables created successfully.")
+
+except sqlite3.Error as e:
+    print("Database error:", e)
\ No newline at end of file
diff --git a/assignment9/sql_intro_2.py b/assignment9/sql_intro_2.py
new file mode 100644
index 0000000..2051386
--- /dev/null
+++ b/assignment9/sql_intro_2.py
@@ -0,0 +1,41 @@
+import sqlite3
+import pandas as pd
+
+try:
+    with sqlite3.connect("../db/lesson.db") as conn:
+        sql_statement = """
+        SELECT line_items.line_item_id,
+               line_items.quantity,
+               line_items.product_id,
+               products.product_name,
+               products.price
+        FROM line_items
+        JOIN products ON line_items.product_id = products.product_id
+        """
+
+        df = pd.read_sql_query(sql_statement, conn)
+
+        print(df.head())
+
+        df["total"] = df["quantity"] * df["price"]
+
+        print(df.head())
+        summary_df = df.groupby("product_id").agg(
+        line_item_count=("line_item_id", "count"),
+        total_paid=("total", "sum"),
+        product_name=("product_name", "first")
+)
+
+    print(summary_df.head())
+
+    summary_df = summary_df.sort_values("product_name")
+
+    summary_df.to_csv("order_summary.csv")
+
+    print(summary_df.head())
+
+except sqlite3.Error as e:
+    print("Database error:", e)
+
+
+
diff --git a/csv/customers.csv b/csv/customers.csv
new file mode 100644
index 0000000..4ab941b
--- /dev/null
+++ b/csv/customers.csv
@@ -0,0 +1,101 @@
+customer_id,customer_name,contact,street,city,country,postal_code,phone
+1,"Short, Taylor and Brown",Andrew Woods,3104 Allen Mall,Scottton,Mauritania,91825,+82 +1-536-993-0030
+2,Glover-Hernandez,Kathleen Callahan,46716 Graves Drive,West Kimberg,Myanmar,75905,+234 447-861-4700x71251
+3,Conrad-Harris,Mark Hill,4945 Harvey Greens Suite 329,Matthewmouth,Northern Mariana Islands,23860,+262 639 691.737.9008
+4,Patterson-Smith,Russell Peterson,574 Harvey Vista Suite 020,Lake Tammyport,San Marino,75100,+373 2 001-230-218-0321x1805
+5,Mccann-Thompson,Jacob Myers,988 Brittney Walk Suite 803,New Rebecca,Albania,04586,+358 18 001-264-844-5618x991
+6,Kelly-Oconnell,Amber Harmon,5076 Pamela Estates,Lake Rachel,Malawi,59981,+39 06 698 262.613.2527
+7,"Stephens, King and Johnson",Amanda Walker,8142 Crawford Mission,Port Jonathanshire,Grenada,15468,+1 284 001-675-402-4532x8276
+8,Williams-Mack,Zachary Walker,24067 David Land,North Rickytown,Sri Lanka,23962,+420 (989)498-0714
+9,Clark-Brooks,Matthew Nguyen,852 Melton Fall,West Mariafurt,Turkey,35212,+57 (899)758-1468x885
+10,Galloway-Coleman,Sean Chang,64742 Darren Parkway,Matthewhaven,Nicaragua,71733,+216 001-669-730-9178
+11,"Mills, Torres and Graham",Matthew Rangel,521 Sampson Loop Suite 683,West Dawn,Algeria,85945,+507 366.980.7640
+12,Preston-Wright,Shawn Weber,18139 Christian Island Apt. 864,Richardfort,Senegal,29567,+211 6025619622
+13,Owens-Mclaughlin,Matthew Pierce,96172 Barbara Highway,Lisaside,Netherlands Antilles,40335,+356 (322)267-5055x817
+14,Dean Ltd,Benjamin Huber,2887 Mills Vista Apt. 076,North Lisa,Zambia,57988,+39 (306)239-8565
+15,Mills Inc,Gilbert Ramos,721 Barrett Path Apt. 626,Frankland,Libyan Arab Jamahiriya,27619,+596 +1-276-449-4908x293
+16,Perez and Sons,Margaret Gardner,279 Angie Circles,Lake Rebeccaborough,Maldives,03033,+882 16 702-415-0969x8783
+17,"Neal, Baxter and Thompson",Kristen Flynn MD,42153 Smith Plaza,Hallbury,Germany,53344,+39 9158142105
+18,Garcia-Mcgrath,John Johnson,19407 Gallagher Crossroad Suite 600,South Matthewland,Sudan,45340,+683 4684301465
+19,"Serrano, Armstrong and Taylor",Stacy Allen,494 Debra Land,Matthewborough,Guinea-Bissau,16386,+678 (234)657-2167x436
+20,Salas-Ruiz,Arthur Chavez,185 Lee Street Suite 551,Trevorfurt,Pakistan,04412,+1 664 +1-749-367-7829x2179
+21,Meyer Ltd,Lisa Patton,292 Hutchinson Court Apt. 294,Jillianfurt,Tonga,53888,+32 872.578.2697
+22,Williams-Higgins,David Robinson,6150 Jennifer Rue Apt. 594,West Peter,Nepal,17401,+888 (760)264-2789x3312
+23,"Davis, Salinas and Johnson",Maria Ali,2253 Robert Course,West Rachael,Norway,11260,+882 13 250-992-3486x06384
+24,Ross Ltd,April Lee,9927 Rangel Union,Brennanland,Pitcairn Islands,68459,+1 345 +1-990-442-2922
+25,Vasquez and Sons,Dominic Freeman,1997 Cohen Crossing Suite 001,South Daniel,New Caledonia,90989,+52 +1-460-874-7358
+26,Johnson Inc,Dennis Nielsen,346 Linda Plains Suite 250,New Julie,Tunisia,78450,+973 878-371-0298x9071
+27,Smith-Moore,Chris Kim,2952 Richardson Wells,Port Larry,Zambia,32492,+91 (359)757-9911
+28,Bryant-Hinton,Matthew Francis,81705 Jennifer Branch,Lake Robertview,Guinea-Bissau,01736,+686 370-603-2757
+29,"Reynolds, Pollard and Day",Cody Harrell,51011 Martinez Island,East Michael,Saint Helena,49122,+599 9 760-278-8510x36690
+30,"Weiss, Sanders and Clark",Alicia Doyle,82122 Keith Center,Brianashire,Afghanistan,15308,+92 001-636-335-4769
+31,"Lowe, Acevedo and Thompson",Heather Gutierrez,69013 Kelley Springs Apt. 481,Ronaldland,United Arab Emirates,23846,+590 +1-765-786-8831x539
+32,Chambers-Anderson,Victoria Ali,7284 Shane Ports Apt. 317,West Douglas,Guam,41321,+44 7924 (690)421-4096x407
+33,Delacruz-Powell,Evelyn Neal,6109 Dawn Cliff,South Cynthia,Bangladesh,59906,+256 001-786-917-7545x549
+34,Wise Group,Jeremy Holland,6905 Andrade Square,West Matthew,Austria,16337,+994 318.723.5942x03732
+35,Espinoza Inc,David Hudson,720 Amber Estate,Port Cassandraview,Sierra Leone,94780,+598 827.804.7412x684
+36,"Burke, Wilkerson and Coleman",Kim Davis MD,68999 Pierce Way Apt. 263,North Scott,Reunion,82849,+968 650-402-5555
+37,Cox-Moyer,Shannon Mccullough,007 David Avenue Suite 742,Campbellburgh,Cambodia,72332,+685 996-802-9411x841
+38,"Walsh, Costa and Oconnor",Christine Taylor,30328 Gregory Station Apt. 545,North Daniel,Spain,14265,+255 24 +1-553-492-1933x589
+39,"Ray, Shaw and Miller",Jason Rush,349 Rivera Rapid Apt. 628,Spencerland,Fiji,26741,+979 001-224-412-7788x646
+40,"Proctor, Cooley and Coleman",Melanie Woods,839 Mccormick Bridge,East John,Oman,76457,+590 (380)583-9156x7682
+41,Hogan Inc,Michael Jones,37445 Joseph Valley Suite 003,Jonmouth,Palestinian Territory,57860,+975 (948)612-0559x419
+42,"Phillips, Bush and Miller",Andrea Stevens,55310 Harris Springs,Schmidtmouth,Qatar,59359,+672 +1-261-295-9832x1971
+43,Solis Group,Tammy Walters,6393 Patricia Circles,North John,Brunei Darussalam,17162,+237 4783325433
+44,Esparza-Terry,Jason Dawson,21012 Brock Tunnel,Christinefurt,Palau,40098,+55 714-878-1327x79527
+45,"Bailey, Henderson and Bailey",Joshua Morgan,39079 Yoder Ridge,Martinezburgh,Austria,66784,+964 880.421.9411x37322
+46,Walters Inc,Eddie Olson,60648 Kaitlyn Ways,Erikfort,Bermuda,06185,+66 001-885-880-1386
+47,Johnson PLC,Glenda Gregory,09100 Greg Fields Suite 841,North Kayla,Serbia,01909,+970 490-988-7105
+48,Anderson and Sons,Abigail Riley,5846 Joseph Branch Apt. 487,Holdenchester,Saint Martin,10136,+299 669-515-9554x3928
+49,Powell Group,Shawn Cruz,27581 Lee Island,Codyberg,Ghana,49748,+223 609-203-8403
+50,"Hardy, Smith and Smith",Brian Stephens,3736 Harris Oval Apt. 027,Rileytown,Palestinian Territory,07020,+61 89164 343-410-8563x426
+51,Fox Inc,Terry Allen,2597 Antonio Locks Apt. 946,Garzaville,Central African Republic,37216,+500 438.443.9141
+52,Young-Cobb,Tammy Taylor,7877 Edwards Stravenue,New Wandachester,Luxembourg,50287,+881 1 001-574-923-7538x0257
+53,"Martin, Harris and Brooks",Jennifer Douglas,8304 Mia Court,Lake Carl,Isle of Man,98247,+290 783-894-7720
+54,Hodges and Sons,Karen Barron,6331 Cole Glen Apt. 945,Ariasfort,American Samoa,77767,+599 9 +1-808-423-4564x033
+55,Wilson Inc,Shawn Benjamin,154 Pollard Junction,Beckerfort,Ukraine,35477,+33 3632393107
+56,Saunders-Huffman,Andrea Foster,86832 Morrow Prairie,North Kelly,Somalia,75324,+234 729.843.1316x90623
+57,"Owens, Reese and Villa",Tyler Watson,267 Hart Drive Apt. 357,Brentport,Rwanda,22919,+211 5402700198
+58,Schroeder Ltd,Mike Baldwin,38983 Jason Square Suite 828,North Dustinmouth,Trinidad and Tobago,26171,+1 784 (432)493-4710x7366
+59,"Frazier, Brooks and Ramirez",Karla Church,333 Jill Alley Suite 373,West Paul,Malaysia,86114,+881 6 001-690-676-5097x1557
+60,"Barber, Warner and Moon",Jay Stone,576 Meghan Groves,Patriciaville,Burkina Faso,77025,+687 (908)791-0226x4365
+61,Conner-Cunningham,Gregory Benjamin,506 Richard Road Apt. 608,Richardsmouth,Oman,05983,+878 (889)917-8446
+62,Jordan Ltd,Jonathan Anderson,08205 Trevino Extensions,Erinshire,Mongolia,73172,+881 9 +1-378-478-0918x277
+63,Dennis Group,Craig Lee,82763 Melendez Underpass,Port Ryan,Saint Helena,31457,+359 +1-970-903-0707x31839
+64,Wall-Mcmillan,Joseph Martin,883 Jamie Forge Apt. 064,Aliciaberg,Guadeloupe,83751,+240 335.817.2866
+65,Smith-Walker,Michael White,0118 Hubbard Center,Jasonburgh,Tanzania,86309,+420 707-654-5891
+66,Graham Inc,Amber Allen,578 Alyssa Mission Suite 337,Careytown,Cuba,26775,+670 472.311.5090x63460
+67,Williams LLC,Charles Berger,59807 Nunez Ports,Evansstad,Tonga,19622,+86 553-685-4446x005
+68,"Brooks, Cox and Martin",Ariana Murphy,508 Veronica Parkway Apt. 411,Carrollshire,Ukraine,91146,+504 572.871.1204x32747
+69,Johnson-Dillon,Dawn Tanner,16284 Marcus Road Apt. 687,Hammondstad,Heard Island and McDonald Islands,09847,+90 392 410-249-4779
+70,Sullivan Ltd,Maria Massey,8808 Reyes Plains,Sullivanfurt,British Virgin Islands,30660,+64 614.901.7994x8695
+71,Collins-Cabrera,Tony Olsen,01686 Christopher Flats,Yolandafort,Chile,76327,+963 507.706.7176x72538
+72,Snyder-Ward,Vincent Nunez,33923 Hernandez Ridge Apt. 431,Brownfurt,Bulgaria,88381,+257 (935)568-2730
+73,"Ramsey, Buchanan and Berger",Lee Welch,166 Ashley Rapids Apt. 508,East Brian,Papua New Guinea,14997,+239 969-816-1425x5451
+74,"Callahan, Melendez and Brooks",Lisa Ramsey,80540 Mike Corners,Gallaghermouth,Timor-Leste,05763,+881 7 864-849-0165x383
+75,Rodriguez-Smith,Haley Jackson,13865 Leah Shoals,Daniellebury,Singapore,88899,+262 639 (656)266-9976x155
+76,Rivera Group,Danielle Small,7504 Michael Forges,Lake Scottside,Peru,10107,+66 334-271-4947x543
+77,Moss LLC,Teresa French,358 Hawkins Cape Suite 179,Port Jamesfurt,Equatorial Guinea,39282,+1 869 001-702-453-4851
+78,Miller Ltd,Christopher Harding,16779 Gaines Pines,Port Emilybury,French Polynesia,49688,+1 787 773.486.4294x4654
+79,Gill-Wu,Lauren Wallace,3979 Hernandez Dam,Maldonadoland,Seychelles,94705,+7 7 445-368-2918
+80,Russell Ltd,Adam Wells,6349 Dillon Walks,East Leroy,Netherlands,89085,+27 (511)539-8534x5085
+81,Wright-Liu,Scott Cooley,272 Jason Summit,New Josephmouth,Bolivia,32636,+44 7624 255-335-6363
+82,Johnson LLC,Roger Johnson,745 Howell Square Suite 402,West Sharonbury,Reunion,56963,+359 001-577-254-3040x65663
+83,Roach-Vance,Heather Carter,70512 Jennifer Court Apt. 111,East Ian,Denmark,31831,+500 473.526.3442x778
+84,Zimmerman-Nichols,Steven Adams,53941 Jenkins Squares Apt. 306,Jacksonville,Italy,20728,+61 5355112995
+85,Mills-Lee,Paul Butler,83012 Cameron Alley Suite 465,Alexanderberg,Mauritius,10366,+356 349.304.2204x4442
+86,Williams and Sons,Larry Wolf,567 Bryan Loop,West Douglasville,Hungary,83329,+682 (844)836-0249x3395
+87,"Morse, Gamble and Nielsen",Caleb Martinez,192 Clements Cove Suite 383,Allisonland,Benin,86961,+46 821.455.0676
+88,"Turner, Brown and Humphrey",Bryan Donaldson,46960 Kristy Point,South Richard,Heard Island and McDonald Islands,40299,+30 (336)873-3292
+89,"Jones, Perry and Simpson",Gary Leonard,2750 Smith Rapids,South Vincent,Ethiopia,24732,+222 001-448-765-4306x27651
+90,"Brown, Gutierrez and Trevino",Francisco Reid,1419 Anderson Locks Apt. 916,Charlesview,Uganda,34086,+44 1481 001-679-940-4293x148
+91,Gray and Sons,Walter Cortez,27982 Alex Groves Suite 195,South Chelsea,Belarus,21157,+881 0 +1-540-968-2323
+92,Hall LLC,David Valenzuela,617 Lin Springs,Martinezton,Faroe Islands,71641,+358 001-961-604-6400x66330
+93,"Flores, Day and Thomas",Sarah Bailey,7512 Ricardo Spur Apt. 129,West Wendy,Lesotho,53521,+690 965-950-8716
+94,Mcmahon-Russell,Susan Wilson,6027 White Shoal Apt. 389,North Heathermouth,Norway,59569,+681 6432858874
+95,Pierce LLC,Renee Hamilton,77190 Elizabeth Lights,Lake Michaelburgh,Northern Mariana Islands,74306,+881 6 (991)217-9581x447
+96,Smith Group,James Campbell,683 Alan Drive,East Davidfort,Belarus,65957,+1 264 001-984-480-8124x56878
+97,"Herrera, Griffin and Collins",Colleen Anderson,6755 Jorge Cliffs Suite 040,Robertfort,Christmas Island,81718,+689 9344130980
+98,Fisher and Sons,Brittany Hall,7226 Wells Vista,North Leonardland,Andorra,52421,+46 +1-893-925-6674x565
+99,Martinez LLC,Alexander Moore,51881 Moore Inlet,Crystalfurt,Estonia,59493,+222 (616)864-3066
+100,Pierce-Smith,Sabrina Johnson,8823 Todd Lights Suite 381,Williamsview,Venezuela,22397,+230 +1-382-617-8013x5888
diff --git a/csv/employees.csv b/csv/employees.csv
new file mode 100644
index 0000000..13cb08c
--- /dev/null
+++ b/csv/employees.csv
@@ -0,0 +1,21 @@
+employee_id,first_name,last_name,phone
+1,Cindy,Wade,+222 656-486-3727
+2,David,Thornton,+882 (369)732-4858x56864
+3,Lauren,Martinez,+250 8878764159
+4,Kenneth,White,+64 4924992211
+5,James,Torres,+267 +1-471-316-0190x308
+6,Tracy,Foster,+237 6225761379
+7,Miranda,Harris,+370 001-563-522-4308x77248
+8,Destiny,Nguyen,+226 284.891.0715
+9,Phillip,Williams,+423 4943292679
+10,Kelli,Bowman,+379 (843)240-1818x77648
+11,Gregory,Pittman,+264 9864625899
+12,Natasha,Hoover,+234 649.763.1540x547
+13,Gregory,Jackson,+243 (871)628-0556
+14,David,Clark,+882 805-740-2877x32513
+15,Sarah,Shepherd,+267 721-710-7210x8468
+16,Michael,Quinn,+972 826.201.6869
+17,Logan,Lopez,+64 +1-264-270-6434
+18,Donald,Hunt,+47 79 (579)967-8837x893
+19,Matthew,Meyers,+378 +1-720-722-2062x240
+20,Thomas,Calderon,+64 +1-380-200-3211
diff --git a/csv/line_items.csv b/csv/line_items.csv
new file mode 100644
index 0000000..e1f1d68
--- /dev/null
+++ b/csv/line_items.csv
@@ -0,0 +1,1110 @@
+line_item_id,order_id,product_id,quantity
+1,1,45,6
+2,1,49,20
+3,1,51,11
+4,1,54,17
+5,1,51,7
+6,1,6,2
+7,2,41,6
+8,2,37,5
+9,3,24,16
+10,3,26,18
+11,3,51,5
+12,4,39,18
+13,4,52,20
+14,4,34,16
+15,4,26,6
+16,4,34,14
+17,4,45,19
+18,4,29,14
+19,5,4,14
+20,5,24,9
+21,5,13,1
+22,5,58,11
+23,6,47,11
+24,6,14,7
+25,6,6,9
+26,6,54,15
+27,6,9,12
+28,6,35,14
+29,6,6,6
+30,7,1,18
+31,7,51,1
+32,7,35,1
+33,7,45,3
+34,8,2,5
+35,8,15,5
+36,8,9,16
+37,8,1,7
+38,8,36,7
+39,8,2,16
+40,8,15,19
+41,8,4,12
+42,9,36,14
+43,9,45,14
+44,9,44,16
+45,9,21,13
+46,9,2,9
+47,10,20,12
+48,10,33,8
+49,10,38,19
+50,10,12,1
+51,10,58,16
+52,10,34,19
+53,10,14,5
+54,11,49,19
+55,11,15,11
+56,11,47,16
+57,11,57,11
+58,11,5,5
+59,11,2,14
+60,11,6,18
+61,12,55,18
+62,12,15,10
+63,13,26,9
+64,13,2,1
+65,13,52,4
+66,14,19,5
+67,15,50,20
+68,15,35,17
+69,15,12,5
+70,15,40,13
+71,16,15,14
+72,16,25,10
+73,16,43,7
+74,16,7,7
+75,16,51,3
+76,16,36,3
+77,17,2,17
+78,18,59,15
+79,18,28,12
+80,18,40,4
+81,18,43,20
+82,19,41,13
+83,19,35,5
+84,19,50,16
+85,19,1,1
+86,19,29,5
+87,19,43,3
+88,19,36,11
+89,19,49,18
+90,20,14,5
+91,20,13,7
+92,20,24,10
+93,20,5,6
+94,21,38,14
+95,21,20,5
+96,21,36,5
+97,21,17,14
+98,21,31,17
+99,21,19,7
+100,22,14,14
+101,22,4,9
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+990,223,3,2
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+994,225,31,7
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+999,226,17,3
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+1013,229,34,6
+1014,229,2,9
+1015,229,59,15
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+1019,230,31,5
+1020,230,31,19
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+1022,231,53,15
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+1024,231,2,19
+1025,231,38,7
+1026,231,45,13
+1027,232,8,13
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+1029,232,38,13
+1030,232,20,19
+1031,232,15,20
+1032,233,44,11
+1033,233,50,15
+1034,233,29,4
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+1036,233,56,4
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+1039,234,2,19
+1040,234,16,19
+1041,234,41,2
+1042,234,32,20
+1043,234,48,1
+1044,235,31,4
+1045,235,13,18
+1046,235,14,18
+1047,235,40,2
+1048,235,19,14
+1049,236,11,13
+1050,236,36,11
+1051,236,32,7
+1052,236,42,12
+1053,236,34,20
+1054,236,56,1
+1055,236,22,2
+1056,236,56,7
+1057,237,26,3
+1058,237,25,10
+1059,238,2,10
+1060,238,50,14
+1061,238,36,2
+1062,238,55,18
+1063,238,47,4
+1064,238,14,4
+1065,239,10,11
+1066,239,46,9
+1067,239,43,12
+1068,239,38,8
+1069,239,18,12
+1070,239,7,20
+1071,239,45,10
+1072,239,6,16
+1073,240,17,1
+1074,240,50,5
+1075,240,29,18
+1076,240,49,6
+1077,240,37,12
+1078,240,21,10
+1079,240,36,8
+1080,241,12,9
+1081,241,45,4
+1082,241,1,18
+1083,241,47,17
+1084,242,58,5
+1085,242,8,15
+1086,242,6,9
+1087,243,2,19
+1088,243,15,18
+1089,243,53,12
+1090,243,10,20
+1091,243,34,6
+1092,243,50,11
+1093,244,35,6
+1094,244,45,14
+1095,244,57,4
+1096,244,54,1
+1097,244,16,3
+1098,244,4,5
+1099,245,16,4
+1100,246,46,18
+1101,246,7,3
+1102,246,15,16
+1103,246,23,3
+1104,246,5,6
+1105,247,35,18
+1106,247,14,14
+1107,248,2,6
+1108,249,6,19
+1109,249,46,1
diff --git a/csv/minutes1.csv b/csv/minutes1.csv
new file mode 100644
index 0000000..e9fd8d9
--- /dev/null
+++ b/csv/minutes1.csv
@@ -0,0 +1,31 @@
+Name,Date
+Gina Maldonado,"October 31, 1992"
+Tony Henderson,"November 15, 1991"
+Jonathan Parrish,"June 12, 1984"
+Jonathan Parrish,"June 12, 1984"
+Mrs. Samantha Johnson,"July 20, 1984"
+Mrs. Samantha Johnson,"July 20, 1984"
+Joseph Harris,"March 3, 1982"
+Aaron Kaufman,"November 14, 1989"
+Tony Henderson,"November 7, 1988"
+Tony Henderson,"November 7, 1988"
+Tony Henderson,"November 7, 1988"
+Mrs. Samantha Johnson,"July 23, 1991"
+Kimberly Stewart,"December 12, 1987"
+Daniel Jackson,"October 2, 1981"
+Daniel Jackson,"October 2, 1981"
+Joseph Harris,"April 3, 1991"
+Joseph Harris,"April 3, 1991"
+Mrs. Samantha Johnson,"December 23, 1982"
+Mrs. Samantha Johnson,"December 12, 1992"
+Tony Henderson,"October 4, 1990"
+Yesenia Smith,"August 10, 1983"
+Yesenia Smith,"August 10, 1983"
+Joseph Harris,"March 1, 1989"
+Amanda Brown,"August 8, 1984"
+Aaron Kaufman,"October 24, 1988"
+Aaron Kaufman,"July 21, 1990"
+Gina Maldonado,"April 7, 1989"
+Austin Hester,"December 10, 1992"
+Austin Hester,"December 10, 1992"
+Daniel Jackson,"December 13, 1986"
diff --git a/csv/minutes2.csv b/csv/minutes2.csv
new file mode 100644
index 0000000..8169be7
--- /dev/null
+++ b/csv/minutes2.csv
@@ -0,0 +1,31 @@
+Name,Date
+Austin Hester,"March 8, 1981"
+Mrs. Samantha Johnson,"July 10, 1988"
+Sarah Murray,"November 19, 1988"
+Sarah Murray,"November 19, 1988"
+Sarah Murray,"June 27, 1992"
+Gina Maldonado,"February 13, 1987"
+Yesenia Smith,"November 23, 1990"
+Austin Hester,"January 18, 1989"
+Jason Tucker,"April 30, 1991"
+Daniel Jackson,"April 8, 1990"
+Sarah Murray,"October 30, 1984"
+Mrs. Samantha Johnson,"November 28, 1984"
+Mrs. Samantha Johnson,"November 28, 1984"
+Jason Tucker,"September 20, 1980"
+Lori Martin,"July 8, 1991"
+Gina Maldonado,"December 16, 1982"
+Mrs. Samantha Johnson,"December 17, 1981"
+Gina Maldonado,"February 9, 1992"
+Lori Martin,"February 5, 1984"
+Austin Hester,"June 4, 1985"
+Aaron Kaufman,"May 1, 1990"
+Yesenia Smith,"May 6, 1986"
+Yesenia Smith,"May 6, 1986"
+Mrs. Samantha Johnson,"March 12, 1982"
+Sarah Murray,"August 16, 1988"
+Matthew Russell,"May 31, 1991"
+Matthew Russell,"May 31, 1991"
+Jonathan Parrish,"March 18, 1986"
+Jonathan Parrish,"March 18, 1986"
+Jonathan Parrish,"March 18, 1986"
diff --git a/csv/orders.csv b/csv/orders.csv
new file mode 100644
index 0000000..c42c629
--- /dev/null
+++ b/csv/orders.csv
@@ -0,0 +1,250 @@
+order_id,date,customer_id,employee_id
+1,1970-06-10,45,11
+2,1970-06-28,7,2
+3,1970-10-28,34,5
+4,1970-11-03,36,20
+5,1971-03-14,27,14
+6,1971-07-28,27,14
+7,1971-08-04,71,5
+8,1971-10-21,73,11
+9,1971-12-28,96,16
+10,1972-04-04,45,16
+11,1972-06-23,51,13
+12,1972-07-17,81,19
+13,1973-01-21,95,17
+14,1973-02-14,72,10
+15,1973-12-09,55,17
+16,1973-12-14,58,8
+17,1974-01-08,66,7
+18,1974-03-18,31,18
+19,1974-03-25,70,19
+20,1974-05-25,72,12
+21,1974-06-25,93,1
+22,1974-08-24,81,2
+23,1974-09-21,86,11
+24,1975-01-12,16,16
+25,1975-02-05,43,8
+26,1975-02-09,30,7
+27,1975-02-18,41,19
+28,1975-03-24,48,13
+29,1975-04-07,85,14
+30,1975-06-20,32,1
+31,1975-07-10,39,15
+32,1976-04-03,63,12
+33,1976-10-01,56,3
+34,1977-06-19,46,17
+35,1977-08-18,49,8
+36,1978-04-22,36,19
+37,1978-05-11,62,18
+38,1978-05-31,94,17
+39,1979-02-20,48,16
+40,1979-09-07,97,1
+41,1979-10-02,100,11
+42,1979-11-27,79,18
+43,1979-12-01,13,1
+44,1980-04-01,9,1
+45,1980-04-03,45,1
+46,1980-06-01,47,10
+47,1980-07-18,97,9
+48,1980-08-01,76,17
+49,1980-09-05,25,7
+50,1980-11-26,32,3
+51,1981-02-25,15,16
+52,1981-04-18,69,9
+53,1981-04-18,64,14
+54,1981-05-16,8,3
+55,1981-06-27,62,4
+56,1981-08-18,38,19
+57,1981-12-13,35,15
+58,1982-01-01,65,9
+59,1982-01-03,87,15
+60,1982-07-23,13,19
+61,1982-07-24,29,5
+62,1982-09-04,39,5
+63,1983-05-22,2,17
+64,1983-06-14,92,11
+65,1983-10-27,18,6
+66,1984-04-24,19,15
+67,1984-07-15,50,2
+68,1984-12-05,68,13
+69,1986-04-05,45,10
+70,1986-06-03,34,3
+71,1986-06-06,11,13
+72,1986-06-27,23,19
+73,1986-11-14,16,10
+74,1986-12-25,74,9
+75,1987-01-03,21,2
+76,1987-01-22,34,4
+77,1987-02-23,85,19
+78,1987-03-28,48,6
+79,1987-06-18,46,6
+80,1987-11-02,89,13
+81,1988-09-11,100,6
+82,1988-12-26,10,20
+83,1989-10-21,49,5
+84,1990-04-30,19,1
+85,1990-07-08,92,18
+86,1990-08-07,61,19
+87,1990-12-13,51,19
+88,1991-08-09,47,7
+89,1991-08-23,38,8
+90,1992-04-10,77,20
+91,1992-04-28,42,9
+92,1992-10-16,67,11
+93,1992-12-19,25,12
+94,1992-12-23,27,10
+95,1993-01-15,62,5
+96,1993-03-13,54,6
+97,1993-04-14,32,9
+98,1993-04-18,19,9
+99,1993-07-24,3,16
+100,1993-09-23,16,19
+101,1994-07-17,13,10
+102,1994-08-10,44,14
+103,1995-02-22,72,12
+104,1995-02-24,62,7
+105,1995-06-07,44,14
+106,1995-10-03,22,3
+107,1996-03-08,64,11
+108,1996-05-11,81,18
+109,1996-06-01,1,17
+110,1996-10-29,40,7
+111,1997-03-22,52,16
+112,1997-04-04,69,11
+113,1997-10-05,41,17
+114,1997-11-26,40,7
+115,1998-01-09,71,17
+116,1998-05-02,16,17
+117,1998-09-27,34,17
+118,1998-10-12,19,18
+119,1999-03-08,87,9
+120,1999-04-08,6,1
+121,1999-06-16,76,6
+122,1999-06-24,65,20
+123,1999-07-30,48,4
+124,2000-02-25,31,17
+125,2000-06-30,83,9
+126,2001-01-14,55,14
+127,2001-01-18,98,6
+128,2001-03-11,74,5
+129,2001-04-21,86,3
+130,2001-06-12,53,3
+131,2001-06-16,10,1
+132,2001-07-03,32,1
+133,2001-08-12,15,5
+134,2001-10-02,78,8
+135,2001-12-16,76,16
+136,2002-05-02,55,6
+137,2002-09-09,15,3
+138,2003-08-21,64,10
+139,2003-11-28,66,16
+140,2003-12-28,75,3
+141,2004-02-21,46,3
+142,2004-02-23,82,10
+143,2004-08-31,24,20
+144,2004-10-26,43,11
+145,2004-12-30,37,6
+146,2005-06-05,19,14
+147,2005-07-17,5,5
+148,2005-09-11,87,2
+149,2005-09-27,34,11
+150,2006-02-04,80,17
+151,2006-03-11,53,8
+152,2006-07-28,56,5
+153,2006-08-25,41,12
+154,2006-10-18,68,20
+155,2007-01-16,18,4
+156,2007-01-28,63,9
+157,2007-02-22,38,19
+158,2007-03-04,10,8
+159,2007-04-10,53,13
+160,2007-05-15,72,10
+161,2007-06-12,17,10
+162,2007-08-01,66,3
+163,2007-09-19,96,11
+164,2007-12-12,55,10
+165,2008-02-02,58,20
+166,2008-02-12,14,18
+167,2008-05-24,40,6
+168,2008-12-09,93,2
+169,2009-01-14,86,3
+170,2009-02-23,39,15
+171,2009-04-16,47,3
+172,2009-05-19,45,3
+173,2009-07-28,83,7
+174,2010-06-04,40,20
+175,2010-06-23,20,19
+176,2010-09-07,11,12
+177,2010-10-24,51,6
+178,2010-11-07,44,7
+179,2011-01-10,66,1
+180,2011-01-11,53,6
+181,2011-04-18,79,19
+182,2011-04-29,63,15
+183,2011-05-09,17,19
+184,2011-06-04,55,8
+185,2011-08-02,14,5
+186,2011-11-05,8,11
+187,2012-02-24,51,15
+188,2012-03-18,13,12
+189,2012-03-24,59,9
+190,2012-06-10,86,19
+191,2012-10-12,12,4
+192,2013-05-15,31,2
+193,2013-07-24,28,17
+194,2013-08-13,49,11
+195,2014-03-11,56,16
+196,2014-05-31,5,4
+197,2014-09-17,27,15
+198,2014-10-23,45,2
+199,2015-01-21,98,6
+200,2015-05-03,8,13
+201,2015-07-23,59,1
+202,2015-09-09,48,2
+203,2015-11-16,90,11
+204,2016-01-23,51,8
+205,2016-04-15,64,17
+206,2017-01-08,38,19
+207,2017-05-20,11,2
+208,2017-05-30,89,18
+209,2017-08-14,97,20
+210,2017-11-25,14,13
+211,2018-03-14,11,4
+212,2018-09-12,45,4
+213,2018-11-20,87,18
+214,2018-12-06,64,11
+215,2019-02-18,39,7
+216,2019-07-02,19,6
+217,2019-07-28,49,8
+218,2019-09-07,85,7
+219,2019-09-22,98,2
+220,2019-09-25,79,2
+221,2020-01-15,9,15
+222,2020-06-19,55,18
+223,2021-02-17,22,2
+224,2021-04-20,44,14
+225,2021-05-29,7,13
+226,2021-06-05,32,10
+227,2021-06-30,90,11
+228,2021-07-13,54,9
+229,2021-07-30,25,14
+230,2021-10-26,62,18
+231,2021-11-10,34,13
+232,2021-12-03,80,5
+233,2022-01-19,17,18
+234,2022-06-03,89,10
+235,2022-06-10,23,20
+236,2022-07-26,72,14
+237,2022-08-10,57,16
+238,2022-09-18,1,17
+239,2022-10-22,88,10
+240,2023-01-12,1,9
+241,2023-02-22,47,13
+242,2023-04-19,19,12
+243,2023-06-05,92,16
+244,2023-07-19,19,20
+245,2023-08-12,90,19
+246,2023-08-21,73,7
+247,2023-11-21,96,13
+248,2024-04-27,7,8
+249,2024-07-21,81,12
diff --git a/csv/products.csv b/csv/products.csv
new file mode 100644
index 0000000..0d65a3d
--- /dev/null
+++ b/csv/products.csv
@@ -0,0 +1,60 @@
+product_id,product_name,price
+1,Fantastic Shoes,2.25
+2,For repair Soft Table,5.19
+3,Sausages,5.42
+4,Ergonomic Wooden Soap,8.99
+5,Wooden Shoes,8.22
+6,Cotton Bike,8.34
+7,Sleek Granite Car,9.03
+8,Concrete Cheese,1.46
+9,Unbranded Wooden Keyboard,0.83
+10,Cotton Sausages,9.89
+11,Shoes,7.13
+12,Mouse,6.42
+13,Soft Pizza,1.81
+14,Handcrafted Hat,3.55
+15,Small Fish,1.34
+16,Gorgeous Salad,9.85
+17,Fantastic Sausages,8.1
+18,Shirt,0.23
+19,Hat,6.92
+20,Licensed Cheese,3.93
+21,Steel Car,9.18
+22,Small Shirt,6.81
+23,Bike,0.12
+24,Plastic Pants,6.62
+25,Incredible Hat,1.92
+26,Unbranded Chicken,4.86
+27,Table,2.67
+28,Concrete Gloves,5.71
+29,For repair Fresh Fish,9.26
+30,Refined Cotton Sausages,3.78
+31,Steel Mouse,1.24
+32,Tasty Pizza,4.15
+33,Steel Computer,7.42
+34,Concrete Pants,8.52
+35,Practical Fish,8.83
+36,Sleek Concrete Cheese,3.92
+37,Frozen Computer,2.26
+38,Wooden Mouse,5.04
+39,Unbranded Wooden Hat,6.36
+40,Cotton Ball,6.59
+41,Practical Steel Towels,4.49
+42,Mouse,9.46
+43,Salad,0.53
+44,Practical Tuna,1.0
+45,Handcrafted Wooden Fish,8.95
+46,Sausages,3.79
+47,Tuna,9.72
+48,Rubber Mouse,7.85
+49,Steel Sausages,5.35
+50,Fantastic Fish,9.59
+51,Pants,9.89
+52,Rubber Towels,4.72
+53,Ergonomic Cheese,5.01
+54,Licensed Plastic Bike,9.3
+55,Chair,3.62
+56,Refined Ball,6.3
+57,New Fresh Chips,7.73
+58,Intelligent Chips,7.69
+59,Ball,8.45
diff --git a/db/.gitignore b/db/.gitignore
new file mode 100644
index 0000000..c96a04f
--- /dev/null
+++ b/db/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore
\ No newline at end of file
diff --git a/load_db.py b/load_db.py
new file mode 100644
index 0000000..a75941d
--- /dev/null
+++ b/load_db.py
@@ -0,0 +1,77 @@
+import pandas as pd
+import sqlalchemy as sa
+import sqlite3
+import os
+db_path = "./db/lesson.db"
+
+if os.path.exists(db_path):
+    answer = input("The database exists.  Do you want to recreate it (y/n)?")
+    if answer.lower() != 'y':
+        exit(0)
+    os.remove(db_path)
+
+with sqlite3.connect("./db/lesson.db",isolation_level='IMMEDIATE') as conn:    
+    conn = sqlite3.connect("./db/lesson.db",isolation_level='IMMEDIATE')
+    conn.execute("PRAGMA foreign_keys = 1")
+    cursor = conn.cursor()
+    # customer_name,contact,street,city,country,postal_code,phone
+    # Create tables
+    cursor.execute("""
+    CREATE TABLE IF NOT EXISTS customers (
+        customer_id INTEGER PRIMARY KEY,          
+        customer_name TEXT,
+        contact TEXT,
+        street TEXT,
+        city TEXT,
+        postal_code TEXT,
+        country TEXT,
+        phone TEXT
+    )
+    """)
+    cursor.execute("""
+    CREATE TABLE IF NOT EXISTS employees (
+        employee_id INTEGER PRIMARY KEY,
+        first_name TEXT,
+        last_name TEXT,
+        phone TEXT      
+    )
+    """)
+    cursor.execute("""
+    CREATE TABLE IF NOT EXISTS products (
+        product_id INTEGER PRIMARY KEY,
+        product_name TEXT,
+        price REAL
+    )
+    """)
+    cursor.execute("""
+    CREATE TABLE IF NOT EXISTS line_items (
+        line_item_id INTEGER PRIMARY KEY,
+        order_id INTEGER,
+        product_id INTEGER,
+        quantity INTEGER,
+        FOREIGN KEY(order_id) REFERENCES orders(order_id),
+        FOREIGN KEY(product_id) REFERENCES products(product_id)
+    )
+    """)
+    cursor.execute("""
+    CREATE TABLE IF NOT EXISTS orders (
+        order_id INTEGER PRIMARY KEY,
+        customer_id INTEGER,
+        employee_id INTEGER,
+        date TEXT,
+        FOREIGN KEY(customer_id) REFERENCES customers(customer_id),
+        FOREIGN KEY(employee_id) REFERENCES employees(employee_id)
+    )
+    """)
+ 
+# Create a database engine
+engine = sa.create_engine('sqlite:///db/lesson.db')
+
+tables = ["customers", "employees", 
+          "products", "orders", "line_items"]
+
+for table in tables:
+    t_name = table.lower()
+    csv_file = "./csv/" + table + ".csv"
+    data = pd.read_csv(csv_file, sep=',')
+    data.to_sql(t_name, engine, if_exists='append', index=False)
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..5390e16
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,6 @@
+pytest==8.1.1
+pandas==2.2.3
+sqlalchemy==2.0.36
+jupyter_client==8.6.3
+jupyter_core==5.7.2
+nbstripout==0.8.1
\ No newline at end of file
diff --git a/sqlcommand.py b/sqlcommand.py
new file mode 100644
index 0000000..f9fa419
--- /dev/null
+++ b/sqlcommand.py
@@ -0,0 +1,68 @@
+import readline  # Provides command line editing and history
+import sqlite3   # For SQL command execution
+import sys
+conn = sqlite3.connect("./db/lesson.db",isolation_level='IMMEDIATE')
+conn.execute("PRAGMA foreign_keys = 1")
+
+cursor = conn.cursor()
+
+
+tables = cursor.execute("SELECT name FROM sqlite_schema WHERE type='table' ORDER BY 'name'").fetchall()
+print("The tables in this database are:")
+for row in tables:
+    print(row[0])
+print("Enter SQL statements below, ending with a semicolon.  Or, type exit to quit.")
+
+def main():
+    # Connect to an in-memory SQLite database (or replace with a file database)
+    
+    # Initialize command history and command input buffer
+    command_buffer = []
+    print("Welcome to the SQL shell! Type 'exit;' to quit.")
+
+    while True:
+        try:
+            # Prompt depending on whether we're in the middle of a command
+            prompt = "sql> " if not command_buffer else "   -> "
+            line = input(prompt)
+
+            # Check for exit command
+            if line.strip().lower() == "exit;":
+                print("Exiting.")
+                break
+
+            # Add line to the command buffer
+            command_buffer.append(line)
+
+            # If line ends with a semicolon, it's the end of a command
+            if line.strip().endswith(";"):
+                # Join all lines in the buffer into a single command
+                full_command = " ".join(command_buffer).strip()
+                
+                # Clear the buffer
+                command_buffer = []
+
+                # Execute the command and handle any SQL exceptions
+                try:
+                    cursor.execute(full_command)
+                    results = cursor.fetchall()
+                    for row in results:
+                        print(row)
+                except sqlite3.Error as e:
+                    print(f"SQL Error: {e}")
+                
+                # Commit changes if it’s an INSERT, UPDATE, or DELETE
+                conn.commit()
+                
+        except EOFError:  # Handle Ctrl-D (EOF) gracefully
+            print("\nExiting.")
+            break
+        except KeyboardInterrupt:  # Handle Ctrl-C (interrupt)
+            print("\nCommand canceled.")
+            command_buffer = []  # Reset the command buffer
+
+    # Clean up the database connection
+    conn.close()
+
+if __name__ == "__main__":
+    main()