Postgresql Current timestamp on Update

Question

What is the postgres equivalent of the below mysql code

CREATE TABLE t1 (
  created TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  modified TIMESTAMP DEFAULT CURRENT         


        

Answer 1

Just make sure all tables have the same columnname:

CREATE OR REPLACE FUNCTION upd_timestamp() RETURNS TRIGGER 
LANGUAGE plpgsql
AS
$$
BEGIN
    NEW.modified = CURRENT_TIMESTAMP;
    RETURN NEW;
END;
$$;

CREATE TRIGGER t_name
  BEFORE UPDATE
  ON tablename
  FOR EACH ROW
  EXECUTE PROCEDURE upd_timestamp();