SQL Formatter

What is an SQL Formatter and what does it do?

An SQL Formatter (also known as an SQL Beautifier) is a developer utility that takes raw, unformatted, or minified SQL code and transforms it into a clean, structured, and highly readable format. In the fast-paced world of database development, SQL queries can quickly become complex and difficult to follow, especially when they involve multiple joins, nested subqueries, and long lists of columns.

Our tool automates the process of adding consistent indentation, proper line breaks, and standardized capitalization for SQL keywords (like SELECT, FROM, and WHERE). This not only makes the code more aesthetically pleasing but significantly reduces the time required for code reviews and debugging sessions.

How to use the SQL Formatter

Beautifying your queries is fast and secure:

1. Paste your Code: Copy your raw SQL query and paste it into the input area.
2. Select Dialect: Choose your database system (e.g., PostgreSQL, MySQL, or SQL Server) to ensure the formatter respects specific syntax rules.
3. Instant Transformation: The tool will immediately provide a formatted version in the results box.
4. Copy and Use: Click the "Copy" button to grab the clean code for your editor, documentation, or Slack message to a colleague.

The "Formula": Standard SQL Formatting Rules

While different teams have different style guides, our formatter follows industry-standard best practices:

• Keyword Capitalization: All SQL keywords are converted to UPPERCASE to distinguish them from table and column names.
• Consistent Indentation: Related clauses (like those inside a JOIN or CASE statement) are indented to show hierarchical relationships.
• One Clause Per Line: Major clauses like SELECT, FROM, WHERE, and ORDER BY are placed on new lines.
• Comma Placement: Commas in column lists are consistently placed (usually at the end of lines) to make the list easy to scan.

Worked example: Before and After

Before (Raw SQL):

select id,name,email from users join orders on users.id=orders.user_id where status='active' and price > 100 order by name asc

After (Formatted SQL):

SELECT
  id,
  name,
  email
FROM
  users
  JOIN orders ON users.id = orders.user_id
WHERE
  status = 'active'
  AND price > 100
ORDER BY
  name ASC

Practical tips for Database Developers

• Improve Code Reviews: Always format your SQL before submitting it for review. Clean code is much easier for your peers to understand and verify.
• Debug Complex Joins: If a query isn't returning the results you expect, formatting it can help you see if you've accidentally created a Cartesian product or used the wrong join condition.
• Documentation: When including SQL snippets in your technical documentation or README files, use a formatter to ensure they are professional and easy for others to read.
• Consistency: Using an automated tool ensures that every developer on your team follows the same style, making the entire codebase more cohesive.

Frequently asked questions

Is my data safe? Yes. All formatting is done locally in your browser using JavaScript. Your database queries, which might contain sensitive schema names or values, are never sent to our servers.

Does it support DDL and DML? Yes. Our tool can format SELECT queries (DQL), INSERT/UPDATE/DELETE statements (DML), and CREATE/ALTER/DROP commands (DDL).

Which dialects are supported? We support standard SQL-92 as well as specific syntax for PostgreSQL, MySQL, MariaDB, SQL Server (TSQL), and Oracle.