In my service club db I have a persons table for members and a clubs table for clubs in our district of 68 clubs.

I have the club number/id and club name in both tables.

What I want do do is when the club number is changed in a person record (member has transferred between clubs)

I put the following trigger (using HeidiSQL v6.0) on table persons after update, but nothing happens. The code runs when I do it programatically or from a query browser.

PHP Code:
-- Intended to update clubname attribute in persons table when 
-- a member is moved between clubnames by changing his/her club number
UPDATE persons
    SET clubname 
= (
SELECT clubname
        FROM clubs
        WHERE persons
.clubid clubs.clubno
Any ideas what I need to do to make this work?

This will be the first time I've done a trigger, though I've been using MySQL/PHP for a number of years. Incidentally, I know this may not be the most efficient way of doing the clubname for the persons table, but I designed this when I was learning MySQL and fixing it is not near the top of my task list.

My thanks in advance.