SQL Code Formatter

About the Formatter

Fast tool for cleaning up massive production queries.

SQL Style Guide: Best Practices (2025)

If you are a DBA, Data Engineer, or Backend Developer, following a style guide is crucial. Here are the golden rules our tool applies automatically:

1. Keywords in Uppercase

Although SQL is case-insensitive, the worldwide convention is to write commands like SELECT, FROM and WHERE in uppercase.

2. One Clause Per Line

Never write a complex query in a single line. The ideal approach is to break the line at each main clause.

SELECT 
  id, 
  name, 
  email 
FROM users 
WHERE active = 1 
  AND created_at > '2023-01-01' 
ORDER BY id DESC;

3. Consistent Indentation

Always use 2 or 4 spaces to indent sub-clauses. Our tool lets you choose between Spaces or Tabs.

SQL Terms Glossary

For beginners, understanding the structure of a query can be confusing. Here is a quick summary:

SELECT

The most basic command. Defines which columns of data you want to retrieve.

JOIN (Inner, Left, Right)

Used to combine rows from two or more tables.

• INNER JOIN: Returns records when there is a match in both tables.
• LEFT JOIN: Returns all from the left table, even without a match on the right.

GROUP BY vs ORDER BY

GROUP BY groups rows with the same values (used with COUNT or SUM). ORDER BY just sorts the result.

Common Questions