Hello! Welcome to the 28th session of the Python Master Course. In the previous Lesson 27, we mastered decorators. This time, it's context managers. In Lesson 16, we learned the 'with open(...) as f:' ...

Intermediate - Aggregate functions (COUNT, SUM, AVG, MAX, MIN) - Subqueries and nested queries - Common Table Expressions (WITH clause) - CASE statements for conditional logic in queries 3.