Raising error in postgreSQL

Question

CREATE OR REPLACE FUNCTION msgfailerror() RETURNS trigger AS 
\' BEGIN 
    IF NEW.noces< new.first_column THEN 
        RAISE EXCEPTION \'cannot have a negative sala         


        

Answer 1

The quoting is wrong. It's easier to use dollar quotes $$:

CREATE OR REPLACE FUNCTION msgfailerror() 
RETURNS trigger AS 
$$
BEGIN 
  IF NEW.noces< new.first_column THEN 
    RAISE EXCEPTION 'cannot have a negative salary'; 
  END IF; 
  return new; 
END;
$$
LANGUAGE plpgsql;

But on the other hand, what's wrong with a check constraint?