At 03:16 p.m. 27/11/2012, Robert Gilland wrote: >We need to do a lot of checking in update triggers to check for value changes. > >ie if( OLD.FIELD1 <> NEW.FIELD1 )OR( OLD.FIELD2 <> NEW.FIELD2 )THEN > DO SOMETHING; > >However if either value is NULL then the response will be NULL. > >Is there an easy way to compare values, taking into account these values may >be NULL?
From v.2 onwards you can use the IS [NOT] DISTINCT FROM predicate. (Look it up in the LangUpdate doc.) In 1.0 and 1.5 you're stuck with the multiple predicates. ./hb
