Write complex SELECT queries with multiple JOINs
Use window functions for rankings and running totals
Design normalized databases with ERDs
Build CTEs for readable, maintainable analytics
Tune query performance with EXPLAIN and indexes
Create views and stored procedures
Write ACID-compliant transactions
Model one-to-many and many-to-many relationships
Apply 1NF, 2NF, and 3NF normalization rules
Build a portfolio-ready analytics project