UofT-DSI | SQL - Assignment 1

02_activities/assignments/DC_Cohort/Assignment1.md

@@ -210,4 +210,6 @@ Consider, for example, concepts of fariness, inequality, social structures, marg
 
 ```
 Your thoughts...
+Riz's story, as well as the reality faced by many people in Pakistan, seems so distant and shocking at first glance. However, upon some more reflection, I find there are aspects of this ethical discussion that I can relate to. As an international student since my undergraduate career, I've always been flagged when applying for scholarships, entering the country, and even exploring job opportunities. Although I understand the importance of differentiating residence/immigration status to ensure the safety and fairness in the country, at times, the fact that my identity and value all of a sudden gets undermined by one line in the country's database - "international student visa" - crushes my dreams and hopes I once brought with me when I first arrived in Canada. For example, because I immediately disquality for most scholarship or bursary opportunities as an international PhD student, I am unable to bring funds independently for my supervisor. Although unintended, this leads to a sense of inferiority within my lab and department, as the inability to bring in funds is frowned upon by supervisors. This immediate disqualitifaction because of my status in the databases despite my grades, experience, and outputs outperforming other candidates seem quite unfair. Although necessary from the perspective of security, marginalization and inequalities are discreetly implied by our governmental and even institutional databases. Another thought I had was the question of privacy with the emerging intersection of technology and our societies. When you travel to Asia (e.g., China), they now simply scan your face to enter the country or even to make purchases at convenience stores... Yes, this may seem convenient, but this also means it is that much easier for the government to follow and track your steps - perhaps there's a database of every action, purchase, or even word I've said! 
+
 ```

02_activities/assignments/DC_Cohort/assignment1.sql

@@ -6,7 +6,8 @@
 --SELECT
 /* 1. Write a query that returns everything in the customer table. */
 --QUERY 1
-
+SELECT * 
+FROM customer;
 
 
 
@@ -16,8 +17,10 @@
 /* 2. Write a query that displays all of the columns and 10 rows from the customer table, 
 sorted by customer_last_name, then customer_first_ name. */
 --QUERY 2
-
-
+SELECT *
+FROM customer
+ORDER BY customer_last_name, customer_first_name
+LIMIT 10;
 
 
 --END QUERY
@@ -27,7 +30,10 @@ sorted by customer_last_name, then customer_first_ name. */
 /* 1. Write a query that returns all customer purchases of product IDs 4 and 9. 
 Limit to 25 rows of output. */
 --QUERY 3
-
+SELECT *
+FROM customer_purchases
+WHERE product_id IN (4,9)
+LIMIT 25;
 
 
 
@@ -42,7 +48,10 @@ filtered by customer IDs between 8 and 10 (inclusive) using either:
 Limit to 25 rows of output.
 */
 --QUERY 4
-
+SELECT *, (quantity * cost_to_customer_per_qty) AS price
+FROM customer_purchases
+WHERE customer_id BETWEEN 8 AND 10
+LIMIT 25;
 
 
 
@@ -55,7 +64,12 @@ Using the product table, write a query that outputs the product_id and product_n
 columns and add a column called prod_qty_type_condensed that displays the word “unit” 
 if the product_qty_type is “unit,” and otherwise displays the word “bulk.” */
 --QUERY 5
+SELECT product_id, product_name
+, CASE WHEN product_qty_type = 'unit' THEN 'unit'
+	ELSE 'bulk'
+	END as prod_qty_type_condensed
 
+FROM product;
 
 
 
@@ -66,7 +80,14 @@ if the product_qty_type is “unit,” and otherwise displays the word “bulk.
 add a column to the previous query called pepper_flag that outputs a 1 if the product_name 
 contains the word “pepper” (regardless of capitalization), and otherwise outputs 0. */
 --QUERY 6
-
+SELECT product_id, product_name
+, CASE WHEN product_qty_type = 'unit' THEN 'unit'
+	ELSE 'bulk'
+	END as prod_qty_type_condensed
+, CASE WHEN product_name LIKE '%pepper%' THEN 1
+	ELSE 0
+	END as pepper_flag
+FROM product;
 
 
 
@@ -78,7 +99,13 @@ contains the word “pepper” (regardless of capitalization), and otherwise out
 vendor_id field they both have in common, and sorts the result by market_date, then vendor_name.
 Limit to 24 rows of output. */
 --QUERY 7
+SELECT *
+FROM vendor AS v
+INNER JOIN vendor_booth_assignments as vba
+	ON v.vendor_id = vba.vendor_id
+ORDER BY vba.market_date, v.vendor_name
 
+LIMIT 24;
 
 
 
@@ -92,8 +119,10 @@ Limit to 24 rows of output. */
 /* 1. Write a query that determines how many times each vendor has rented a booth 
 at the farmer’s market by counting the vendor booth assignments per vendor_id. */
 --QUERY 8
-
-
+SELECT vendor_id,
+	COUNT(*) AS vendor_booth_assignments
+FROM vendor_booth_assignments
+GROUP BY vendor_id;
 
 
 --END QUERY
@@ -105,8 +134,14 @@ of customers for them to give stickers to, sorted by last name, then first name.
 
 HINT: This query requires you to join two tables, use an aggregate function, and use the HAVING keyword. */
 --QUERY 9
-
-
+SELECT c.customer_first_name 
+, c.customer_last_name
+, SUM(cp.quantity *cp.cost_to_customer_per_qty) AS total_spent
+FROM customer AS c
+JOIN customer_purchases AS cp ON c.customer_id = cp.customer_id
+GROUP BY c.customer_id
+HAVING total_spent > 2000
+ORDER BY c.customer_last_name, c.customer_first_name;
 
 
 --END QUERY
@@ -124,6 +159,11 @@ When inserting the new vendor, you need to appropriately align the columns to be
 VALUES(col1,col2,col3,col4,col5) 
 */
 --QUERY 10
+CREATE TEMP TABLE new_vendor AS
+SELECT * FROM vendor;
+
+INSERT INTO new_vendor (vendor_id, vendor_name, vendor_type, vendor_owner_first_name, vendor_owner_last_name)
+VALUES (10, 'Thomass Superfood Store', 'Fresh Focused', 'Thomas', 'Rosenthal');
 
 
 
@@ -138,7 +178,11 @@ HINT: you might need to search for strfrtime modifers sqlite on the web to know
 and year are! 
 Limit to 25 rows of output. */
 --QUERY 11
-
+SELECT customer_id
+, strftime ('%m', market_date) AS purchase_month
+, strftime ('%Y', market_date) AS purchase_year
+FROM customer_purchases
+LIMIT 25;
 
 
 
@@ -152,7 +196,12 @@ HINTS: you will need to AGGREGATE, GROUP BY, and filter...
 but remember, STRFTIME returns a STRING for your WHERE statement...
 AND be sure you remove the LIMIT from the previous query before aggregating!! */
 --QUERY 12
-
+SELECT customer_id
+, SUM(quantity * cost_to_customer_per_qty) AS total_spent_april_2022
+FROM customer_purchases
+WHERE strftime ('%m', market_date) = '04'
+	AND strftime ('%Y', market_date) = '2022'
+GROUP BY customer_id;