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Formateur SQL

Poorly formatted SQL is hard to read and debug. Our SQL formatter applies consistent indentation, keyword capitalization, and line breaks to make any SQL query — from simple SELECTs to complex multi-join CTEs — immediately readable. It also supports multiple dialects: MySQL, PostgreSQL, SQL Server, Oracle, and SQLite.

Entrée SQL

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À propos de SQL Formatter & Beautifier

Poorly formatted SQL is hard to read and debug. Our SQL formatter applies consistent indentation, keyword capitalization, and line breaks to make any SQL query — from simple SELECTs to complex multi-join CTEs — immediately readable. It also supports multiple dialects: MySQL, PostgreSQL, SQL Server, Oracle, and SQLite.

Comment l'utiliser

  1. Paste any SQL query (minified or poorly formatted).
  2. Select your SQL dialect for dialect-specific keyword handling.
  3. Choose formatting options: indentation size, keyword case (UPPER/lower), line break style.
  4. See formatted output — copy or download as .sql file.

Formule et méthodologie

No mathematical formula — SQL formatting follows convention: keywords UPPERCASE; identifiers lowercase; each clause (SELECT, FROM, WHERE, JOIN, GROUP BY) on its own line; joined conditions aligned; subqueries indented one level. CTEs formatted with WITH clause on its own line, each CTE separately indented.

Cas d'usage courants

  • Making auto-generated ORM queries readable for debugging
  • Code review: ensuring SQL in stored procedures follows team standards
  • Documentation: formatting queries before including in technical docs
  • Database administration: reading execution plans with formatted queries
  • Legacy code: reformatting decades-old stored procedures for maintainability

Questions fréquentes

Convention strongly favors UPPERCASE keywords (SELECT, FROM, WHERE, JOIN) with lowercase identifiers (table_name, column_name). This visual contrast makes queries scannable — you can identify the structure at a glance. Most style guides (SQL Style Guide, GitLab SQL Style Guide) require uppercase keywords. Some teams prefer all-lowercase for consistency with the rest of their codebase — choose a convention and enforce it consistently.
CTE (Common Table Expression) is a named temporary result set defined with the WITH clause: WITH monthly_sales AS (SELECT ...) SELECT * FROM monthly_sales. Use CTEs when: (1) a subquery is referenced more than once, (2) the logic is complex and benefits from breaking into named steps, (3) you need recursive queries. CTEs don't always improve performance vs subqueries — the optimizer may inline them anyway — but they dramatically improve readability.

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