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Firebird 2.5 Language Ref. Update
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Chapter 12: Operators and predicates
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NULL
literals allowed as operands
||
(string concatenator)
Text
BLOB
concatenation
Result type
VARCHAR
or
BLOB
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
SIMILAR TO
Building regular expressions
SOME
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Firebird 2.5 Language Ref. Update
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