Firebird Documentation Index → Firebird 2.0 Language Ref. Update → Operators and predicates
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Chapter 10: Operators and predicates

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NULL literals allowed as operands
|| (string concatenator)
Result type VARCHAR
Overflow checking
ALL
NULL literals allowed
UNION as subselect
ANY / SOME
NULL literals allowed
UNION as subselect
IN
NULL literals allowed
UNION as subselect
IS [NOT] DISTINCT FROM
NEXT VALUE FOR
SOME

Tip

Find a more recent version at Firebird 5.0 Language Reference: Common Language Elements

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