Lots and lots of tables. It's hard for us because we don't know your schema and we can't test anything.
Try looking for columns that are defined as strings which are being compared to integers.
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