Question

I have two table Name: registeredList & deregisteredlist. Now when a user getting getting deregistered from “registeredlist” table then a trigger update his info to deregistration table and delete the record from registration table. On my below proc i can update it properly but can’t delete the user from registered table. My proc:

DELIMITER $$
USE `abc_db`$$
DROP TRIGGER  `UnsubscriberListTrigger`$$
CREATE        
    TRIGGER `UnsubscriberListTrigger` AFTER UPDATE ON `registeredlist` FOR EACH ROW 
    BEGIN        
     IF (old.SubscriberStatus='registered') THEN    
       INSERT INTO deregisteredlist(name,SubscriberStatus,DeRegistrationDate) 
       VALUES(old.name,'Deregistered',NOW());

       DELETE from registeredlist where old.id=new.id;/???????/I am getting problem here           
     END IF;
 END $$
DELIMITER ;

Thanks in advance.

Answer 1

I think all you need is to change WHERE in DELETE statement.
It should go like this:

DELETE from registeredlist where id=old.id; // (or new.id cause in this case old.id is equal to new.id)

… because you want to match it against id column.

UPDATE:

Another possibility is this:
– create AFTER INSERT TRIGGER on deregisteredlist which will do the DELETE in registeredlist. That way you shouldn’t get that error.