What's the Firebird equivallent of ADDDATE, GETDATE, etc. functions?
There is none as Firebird does date/time arithmetics just like with regular numbers. For example, to delete all records older than 30 days use:
DELETE FROM t1 WHERE d1 < current_date - 30;
This example assumes that table is T1 and date field is D1. Also, take a look at FAQ #35 and FAQ #36.
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