vault/Career/Database - SQL/SQL Joins.md

note type, date, done

note type	date	done
database theory	2026-06-03

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

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