That's a horrible way to do it. You're reading the table 4 times instead of one.
I gave you an example and an article that fully explains that method.
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2