OLD

Available in: PSQL, triggers only

Changed in: 1.5, 2.0

Description

OLD contains the existing version of a database record just before a deletion or update. Starting with Firebird 2.0 it is read-only.

Type: Data row

Note: In multi-action triggers – introduced in Firebird 1.5 – OLD is always available. But if the trigger is fired by an INSERT, there is obviously no pre-existing version of the record. In that situation, reading from OLD will always return NULL; writing to it will cause a runtime exception.