On Thu, 2009-09-03 at 16:25 +0900, Itagaki Takahiro wrote:
> I'd like to check conditions by comparing actual values but not
> a target of UPDATE statement because I think almost user expects
> the former behavior. Unmodified UPDATE-targets are common case
> if we use a framework that generates SQL statements internally.
The SQL standard specifies that a trigger is fired if the column is
mentioned in the UPDATE statement, independent of whether the value is
actually changed through the update.