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();trigger in postgresql to change incoming entry
CREATE or REPLACE FUNCTION func()
RETURNS TRIGGER
AS $$
BEGIN
NEW.columnname = 0;
RETURN NEW;
END;
$$
LANGUAGE plpgsql;
-- Statement to make trigger to execute above code --
CREATE TRIGGER change_incoming BEFORE INSERT on Tablename
FOR EACH ROW EXECUTE PROCEDURE func();Copyright © 2021 Codeinu
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