Ben Chobot <bench@xxxxxxxxxxxxxxx> writes: > Say I have: > create t (c1 int not null, c2 int); > Is it possible to create an update trigger on t such updates will only > be allowed if the update statement explicitly sets c1, even if the new > value is the same? No. A trigger can only tell whether the old and new values are the same or not, not why they are that way. regards, tom lane
