Web Reference: The EXISTS operator is used in a WHERE clause to check whether a subquery returns any rows. The EXISTS operator evaluates to TRUE if the subquery returns at least one row, and FALSE otherwise. Nov 18, 2025 · Specifies a subquery to test for the existence of rows. Transact-SQL syntax conventions. A restricted SELECT statement. The INTO keyword isn't allowed. For more information, see the information about subqueries in SELECT. Boolean. Returns TRUE if a subquery contains any rows. Learn how to use the SQL EXISTS operator to check if a subquery returns any row. See syntax, examples, and comparison with NOT EXISTS and NULL values.
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