create trigger example postgresql

Example 1: example of trigger in postgresql

-- Trigger to update donatiom count in donor table whenever
-- A new donation is made by that person

CREATE or REPLACE FUNCTION increase_count()
RETURNS TRIGGER
AS
$$
BEGIN
	UPDATE donor SET dcount = dcount + 1 WHERE did = NEW.did;
END
$$
LANGUAGE plpgsql;



CREATE TRIGGER update_donation_count AFTER INSERT ON donation
FOR EACH ROW
EXECUTE PROCEDURE increase_count();

Example 2: postgres trigger insert into another table

CREATE TRIGGER trig_copy
     AFTER INSERT ON table1
     FOR EACH ROW
     EXECUTE PROCEDURE function_copy();

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