SQL Formatting Best Practices
Why SQL formatting matters and how to write readable, maintainable database queries.
Well-formatted SQL is easier to review, debug, and maintain. Complex JOINs and subqueries become readable when keywords are capitalized and clauses are on separate lines.
Formatting rules
- Capitalize SQL keywords (SELECT, FROM, WHERE, JOIN)
- Put each major clause on its own line
- Indent nested subqueries and JOIN conditions
- Align column lists vertically in SELECT statements
- Add comments for complex business logic
Common query patterns
- SELECT with multiple JOINs — one JOIN per line
- INSERT with many columns — align VALUES
- UPDATE with WHERE — always include WHERE clause
- GROUP BY with HAVING — separate aggregation filters