> Le 20/07/09 15:19, chester c young a écrit : > > within a trigger need to know if the UPDATE statement > set a column. the column might be set to the old value > or a different value. > > > > (want to make sure the app is sending all necessary > values) > > > > thanks > > > > If the column to test is known -- e.g. column MyCol --, > NEW.MyCol and > OLD.MyCol -- respectively value of MyCol after UPDATE and > value of MyCol > before UPDATE -- can be compared.
for example, create table t1( c1 int, c2 int ); insert into t1 values( 1, 2 ); 1) update t1 set c1=4 where c1=1; 2) update t1 set c1=4, c2=2 where c1=1; each update results in the same row, but in the second update c2 was actually set. a trigger on the update - how do we know if c2 has been actually set or not? -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
