Firebird Documentation IndexFirebird 2.5 Language Ref. UpdateOperators and predicates → IN
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IN

NULL literals allowed
UNION as subselect

Available in: DSQL, ESQL, PSQL

NULL literals allowed

Changed in: 2.0

Description: The IN predicate now allows NULL literals, both as the test value and in the list. Notice that this brings no practical benefits. In particular, “NULL IN (..., NULL, ..., ...)” will not return true and “NULL NOT IN (..., NULL, ..., ...)” will not return false.

UNION as subselect

Changed in: 2.0

Description: A subselect in an IN predicate may now also be a UNION.

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Firebird Documentation IndexFirebird 2.5 Language Ref. UpdateOperators and predicates → IN