mySQL trigger - What is wrong with my syntax? - mysql

Question

I need to write a trigger where if a customerName of an incoming enquiry matches a customer name in a synonymns table then the customerID from that table is used to find the customer in the customer table.
I got a trigger to work which just searched the customer table but not the synonym table first. I was thinking something like: (It's psuedo-esque code)
CREATE TRIGGER `Find Customer` AFTER INSERT ON `enquiry` FOR EACH ROW
BEGIN
INSERT INTO customersmatched (enquiryID, customerID)
SELECT NEW.id, id, customerName, customerID FROM customer, customerSynonyms WHERE
customerSynonyms.customerName = NEW.companyName AND customer.id = customerSynonyms.customerID
HAVING COUNT(id)=1
END;
The error I recieve:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'END' at line 7
But I'm afriad this doesn't work.
Any idea how one would go about this in mySQL? Thanks!
UPDATE
I tried this way too - it didn't work either!
DELIMITER $$
CREATE TRIGGER Find_Customer AFTER INSERT ON enquiry
FOR EACH ROW
BEGIN
IF EXISTS (SELECT customerID FROM customerSynonyms WHERE customerName = NEW.companyName) THEN
IF EXISTS (SELECT id FROM customer WHERE id = #customerID) THEN
INSERT INTO customersMatched (enquiryID, customerID)
HAVING COUNT(id)=1
END IF;
END IF;
END$$
DELIMITER ;
Update 2
It turns out I was WAYYY over complicating things. The customerSynonym table had the customerID stored in a column, which was all I really needed as I could just grab all the data through php with the customerID. The final trigger which works was super simple:
INSERT INTO customersmatched (enquiryID, customerID)
SELECT NEW.id, customerID FROM customersynonyms WHERE
customersynonyms.customerName=NEW.companyName
HAVING COUNT(id)=1
Thanks for all your answers, they're always very much appreciated! :-)

Answer 1

I think you want something like this:
CREATE TRIGGER Find_Customer AFTER INSERT ON enquiry FOR EACH ROW
BEGIN
INSERT INTO customersmatched (enquiryID, customerID)
SELECT NEW.id, customerID FROM customer, customerSynonyms
WHERE customerSynonyms.customerName = NEW.companyName
AND customer.id = customerSynonyms.customerID
HAVING COUNT(id)=1
END;
A few things to note:
I renamed the trigger to Find_Customer. I'm not 100% sure if you can have a space in the trigger name
I removed the single quotes around Find_Customer and enquiry. The single quotes could be read as a string literal by mysql and cause problems. It's better to avoid that if possible.
I changed your select query to only select NEW.id and customerID, since those are the only two things you're inserting. You might have to play with the select a little bit more to get it exactly how you want it.
If this is just part of the trigger, and you have more than just a one-statement trigger, you'll need to set delimiters. Basically, you'd have delimiter | before the trigger definition, and then END| instead of END
Good luck!