CREATE OR REPLACE FUNCTION logs.my () RETURNS TRIGGER AS $$
BEGIN
INSERT  INTO logs.my (operation, tnum, tname) 
SELECT  TG_OP,  OLD.tnum, OLD.tname;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION logs.my () RETURNS TRIGGER AS $$
DECLARE
IF TG_OP = 'INSERT' THEN VAL ALIAS  FOR  NEW ELSE VAL ALIAS FOR OLD END IF;
--VAL ALIAS FOR CASE WHEN  TG_OP = 'INSERT' THEN NEW ELSE OLD END;
BEGIN
INSERT  INTO logs.my (operation, tnum, tname) 
SELECT  TG_OP,  VAL.tnum, VAL.tname;
END;
$$ LANGUAGE plpgsql;

DECLARE
VAL RECORD;
BEGIN
IF TG_OP = 'INSERT' THEN VAL := NEW; ELSE VAL := OLD; END IF;