On Mon, Nov 06, 2023 at 02:23:04PM +0100, Laurenz Albe wrote:
> SET CONSTRAINTS ALL DEFERRED;
Some years ago I wrote and submitted a patch to allow one to create
constraints that are ALWAYS DEFERRED so that they cannot be made
IMMEDIATE with SET CONSTRAINTS ALL IMMEDIATE. I do think that one could
use SET CONSTRAINTS ALL ... to defeat [poorly-coded, perhaps] security
measures taken by triggers.
An example of where one might want triggers that are always deferred
would be a ledger application requiring double-entry, where one might
use deferred triggers to check that all debits have matching credits at
commit-time.
Nico
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