Hi all, this is my table... <http://postgresql.nabble.com/file/n5855422/screenshot.jpg> I only want to select **one** "time" row, **either** WHERE "time_type" = 'Start' OR "time_type" = 'Break', **but only one**, the one that is at the bottom row (descending) (ORDER BY "fn_serial" DESC LIMIT 1). Im successfully doing it by using this Trigger Function... * CREATE OR REPLACE FUNCTION timediff() RETURNS trigger AS $BODY$ DECLARE prevtime character varying; BEGIN SELECT t.time FROM table_ebscb_spa_log04 t WHERE t.fn_name = NEW.fn_name AND (t.time_type = 'Start' OR time_type = 'Break') ORDER BY t.fn_serial DESC LIMIT 1 INTO prevtime; IF NOT FOUND THEN RAISE EXCEPTION USING MESSAGE = 'NOT FOUNDED'; ELSE NEW.time_elapse := prevtime END IF; return NEW; END $BODY$ LANGUAGE plpgsql VOLATILE COST 100; ALTER FUNCTION timediff() OWNER TO postgres;* But in my script I would like to perform different actions depending on whether "fn_type" = 'Start' OR "fn_type = 'Break', I mean where "prevtime" variable came from, eg: * IF "prevtime" came from "fn_type" = 'Start' THEN RAISE EXCEPTION USING MESSAGE = 'PREVTIME CAME FROM START'; ELSIF "prevtime" came from "fn_type" = 'BREAK' THEN RAISE EXCEPTION USING MESSAGE = 'PREVTIME CAME FROM BREAK';* I can guess a way to do that, but its redundant, So I would like to ask suggestions from good PostgreSQL fellow programmers. Thanks Advanced. -- View this message in context: http://postgresql.nabble.com/SELECT-column-WHERE-type-S-OR-type-B-but-perform-different-actions-depending-on-whether-type-S-or-B-tp5855422.html Sent from the PostgreSQL - admin mailing list archive at Nabble.com. -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
