Correct, you need to use bitmasks in sql.
Step #1. Back up, back up, back up.
Step #2. Science!
Somewhat recently I went through and removed gnomes and halflings pal/sk/rng respectively.
Here's the thread with some explanation and sql example for people in the future that might want to see a select/update example.
http://www.project1999.com/forums/sh...494#post785494
I hope it helps.