• Designed and implemented a relational database schema for a hypothetical healthcare research network using MySQL Workbench, modeling complex entities and relationships across hospitals, patients, staffs, research projects, and funding foundations with appropriate foreign key constraints and normalization
• Enforced integrity constraints (e.g., PRIMARY KEY, NOT NULL, CHECK, and UNIQUE) across 20+ Interrelated tables to reflect real-world access control, medical care, and research sponsorship logic
• Developed test scripts to validate referential integrity, entity-level constraints, and complex business rules (e.g., application-level date checks, minimum participation requirements) using INSERT, UPDATE, DELETE, and SELECT queries for consistent verification and error handling