# Where to use Sub-Queries

Where a sub-query can go, as a lookup value or list in WHERE, an EXISTS check, a column value, or a table to join.

![Cheat sheet: Where to use Sub-Queries](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/ec3198fc82eb47cfb06ba491eb438038.webp)

- Category: SQL
- Level: Journeyman
- Tags: mysql, sql
- Updated: November 3, 2026

Source: https://www.ask-codey.com/cheat-sheets/working-with-sub-queries-where-to-use-sub-queries-cheat-sheet