A subquery is a query embedded within another query in a database. It is enclosed in parentheses and retrieves data to be used by the main query. Subqueries can appear in various parts of a SQL statement and help create more complex and flexible queries.

A subquery is a query that appears inside another query statement.

A query that is contained within another query statement is called a subquery. Subqueries can also be called nested SELECTs or sub-SELECTs. In subqueries, the entire SELECT syntax is acceptable.