Record “old” not assigned yet

I have created this trigger:

CREATE TRIGGER trig_update 
AFTER INSERT
ON "delivery" FOR EACH ROW
EXECUTE PROCEDURE premium1();

With this function:

CREATE OR REPLACE FUNCTION premium1() 
RETURNS trigger AS $$
BEGIN
IF (TG_OP='INSERT') THEN
IF(select sum(amount) from delivery where cli_num=OLD.cli_num group by cli_num) > 500.00 THEN
    UPDATE client SET Type ='Gold' WHERE cli_num=OLD.cli_num;
END IF;
END IF;
RETURN NULL;
END;
$$LANGUAGE plpgsql;

When inserting a new value in table delivery I’m getting the below error:

ERROR: record “old” is not assigned yet Stan SQL:55000

Any help on this?

Answer

CREATE OR REPLACE FUNCTION premium1() 
RETURNS trigger AS $$
BEGIN
IF (TG_OP='INSERT') THEN
IF(select sum(amount) from delivery where cli_num=NEW.cli_num group by cli_num) > 500.00 THEN
    UPDATE client SET Type ='Gold' WHERE cli_num=NEW.cli_num;
END IF;
END IF;
RETURN NULL;
END;
$$LANGUAGE plpgsql;