3.1 Introduction to Databases and RDBMS
3.2 Basic SQL Commands (SELECT, WHERE, ORDER BY)
3.3 Joins (INNER, LEFT, RIGHT, FULL)
3.4 Aggregate Functions (COUNT, AVG, SUM)
3.5 Subqueries and Nested Queries
3.6 Window Functions and CTEs
3.7 Real-World Use Case: Querying a Customer Database