Subqueries and Common Table Expressions

Help learners understand this topic clearly, practice it on a small example, and produce reviewable evidence before moving to the next module.

Units

1. Unit 06.00: Subqueries and Common Table Expressions: Read the schema and identify the grain
2. Unit 06.01: Subqueries and Common Table Expressions: Write the query in small testable steps
3. Unit 06.02: Subqueries and Common Table Expressions: Check row counts, joins, filters, and nulls
4. Unit 06.03: Subqueries and Common Table Expressions: Explain what the query proves and does not prove
5. Unit 06.04: Subqueries and Common Table Expressions: Save the final SQL evidence note

Module work

• Activity
• Knowledge check
• Summary