Well-formatted SQL queries are easier to read, debug, maintain, and review. Whether you're writing simple SELECT statements or complex multi-table JOINs, consistent formatting makes a significant difference in code quality.

Key Formatting Rules

1. Uppercase Keywords

SQL keywords should be written in uppercase to distinguish them from identifiers:

SELECT name, email

FROM users

WHERE active = true

ORDER BY created_at DESC

2. One Clause Per Line

Place each major clause on its own line for readability.

3. Consistent Indentation

Indent continuation lines (column lists, JOIN conditions, subqueries) with 2-4 spaces.

4. Meaningful Aliases

Use descriptive aliases instead of single letters when possible:

SELECT u.name, o.total

FROM users AS u

INNER JOIN orders AS o ON u.id = o.user_id

5. Comma Placement

Leading commas make it easier to add/remove columns:

SELECT

, name

, email

FROM users

Common Mistakes to Avoid

Using SELECT * in production queries

Inconsistent casing for keywords

Deeply nested subqueries (use CTEs instead)

Missing table aliases in multi-table queries

Try our SQL Formatter to automatically beautify your SQL queries.