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I think the "best" approach (if that is supported by your DBMS) are ON UPDATE triggers, or if that import is a one time thing only, creating a unique key across all columns:

create or replace function skip_insert() returns trigger language plpg +sql as $$ begin return null; end $$; create or replace function raise_exception() returns trigger language +plpgsql as $$ begin RAISE EXCEPTION 'UPDATE changing row values not allowed'; end $$; CREATE TRIGGER mytrigger ON records INSTEAD OF UPDATE WHEN old.PriKey = new.PriKey and old.Foo=new.Foo and old.Bar=new.B +ar FOR EACH ROW EXECUTE PROCEDURE skip_insert() CREATE TRIGGER mytrigger ON records INSTEAD OF UPDATE WHEN old.PriKey = new.PriKey and (old.Foo!=new.Foo or old.Bar!=new +.Bar) FOR EACH ROW EXECUTE PROCEDURE raise_exception()

... but this approach does not handle NULL values.


In reply to Re: [OT] SQL "on duplicate key" custom action by Corion
in thread [OT] SQL "on duplicate key" custom action by haukex

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