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

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NULL literals allowed
UNION as subselect

Available in: DSQL, ESQL, PSQL

NULL literals allowed

Changed in: 2.0

Description: The ALL predicate now allows a NULL as the test value. Notice that this brings no practical benefits. In particular, a NULL test value will not be considered equal to NULLs in the subquery result set. Even if the entire set is filled with NULLs and the operator chosen is =, the predicate will not return true, but NULL.

UNION as subselect

Changed in: 2.0

Description: The subselect in an ALL predicate may now also be a UNION.

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