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note type:
  - database
  - theory
date: 2026-06-03
done:
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# The SQL JOIN Clause

The JOIN clause is used to combine rows from two or more tables, based on a related column between them.

Here are the different types of JOINs in SQL:

- (INNER) JOIN: Returns only rows that have matching values in both tables
- LEFT (OUTER) JOIN: Returns all rows from the left table, and only the matched rows from the right table
- RIGHT (OUTER) JOIN: Returns all rows from the right table, and only the matched rows from the left table
- FULL (OUTER) JOIN: Returns all rows when there is a match in either the left or right table