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The IN
operator checks containment of the left expression inside the set of expressions on the right hand side (RHS). The IN
operator returns true if the expression is present in the RHS, false if the expression is not in the RHS and the RHS has no NULL
values, or NULL
if the expression is not in the RHS and the RHS has NULL
values.
SELECT 'Math' IN ('CS', 'Math');
-- true
SELECT 'English' IN ('CS', 'Math');
-- false
SELECT 'Math' IN ('CS', 'Math', NULL);
-- true
SELECT 'English' IN ('CS', 'Math', NULL);
-- NULL
NOT IN
can be used to check if an element is not present in the set. X NOT IN Y
is equivalent to NOT(X IN Y)
.
The IN
operator can also be used with a subquery that returns a single column. See the subqueries page for more information.
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Last modified: 2024-03-28