EXISTS

The exists condition is used in combination with a subquery and is considered "to be met" if the subquery returns at least one row.

SQL Syntax

WHERE EXISTS ( <subquery> );

SQL Examples

SELECT number FROM numbers(5) AS A WHERE exists (SELECT * FROM numbers(3) WHERE number=1); 
┌────────┐
│ number │
├────────┤
│      0 │
│      1 │
│      2 │
│      3 │
│      4 │
└────────┘