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

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