The two most helpful things with SQL are (1) always use set-based operations (never a cursor) and (2) break up your queries into smallest possible reusable chun

The two most helpful things with SQL are (1) always use set-based operations (never a cursor) and (2) break up your queries into smallest possible reusable chunks (CTEs). Sprinkle in tests to taste. Without some discipline SQL can get out of hand. This is what made dbt popular.