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create table payment( selling_price NUMERIC, cost_price NUMERIC NOT NULL, profit numeric ); CREATE OR REPLACE FUNCTION trg_foo_b_default() RETURNS trigger AS $body$ BEGIN NEW.profit := NEW.selling_price - NEW.cost_price; RETURN NEW; END $body$ LANGUAGE plpgsql;; CREATE TRIGGER b_default BEFORE INSERT ON payment FOR EACH ROW EXECUTE PROCEDURE trg_foo_b_default(); insert into payment(selling_price,cost_price) values(1000.10,500.10); select * from payment;
1 rows affected
selling_price
cost_price
profit
1000.10
500.10
500.00