SQL Formatter

Readable indentation for SQL queries.

Overview

Formats unreadable, single-line SQL queries into clean, standardized statements with capitalized clauses and indented subqueries.

Formula & Calculation Method

Beautified_SQL = Indent_Clauses(Capitalize_Keywords(Tokenize_SQL(Raw_Query)))

Standardizes reserved SQL keywords (SELECT, FROM, WHERE, JOIN, GROUP BY, ORDER BY) into uppercase and aligns table join clauses.

Worked Example: Formatting Complex E-Commerce Order Query

Inputs: Raw String: select o.id, c.name, sum(o.total) from orders o join customers c on o.cust_id=c.id where o.status='paid' group by o.id, c.name order by o.id desc

  • Capitalize SQL keywords into uppercase.
  • Place major clauses (SELECT, FROM, JOIN, WHERE, GROUP BY, ORDER BY) on dedicated newlines.
  • Indent column projections and join conditions 2 spaces.

Summary: Keywords Standardized | Clauses Aligned | Subqueries Indented

Common Use Cases

  • Database Query Tuning: Format complex analytical queries from ORM logs (Hibernate, Prisma) for query plan analysis.
  • Pull Request Reviews: Clean up migration scripts and stored procedures before merging into database repositories.
  • Documentation & Runbooks: Create beautifully formatted SQL snippets for engineering wikis and runbooks.

Frequently Asked Questions

Which SQL dialects does the formatter support?

Standard ANSI SQL, PostgreSQL, MySQL, SQLite, Oracle PL/SQL, and Microsoft T-SQL syntax.

Why capitalize SQL keywords?

Uppercasing reserved keywords like SELECT and WHERE creates visual contrast against lower-case table and column identifiers.

Is my database query data secure?

Yes, formatting executes entirely client-side; database query strings, table schemas, and parameters are never uploaded.

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