08.06.2010, 14:43
by plus i assume you mean add up, or sum. well i haven't heard of an mysql function that does that, so you should :
1. Extract data
2. Alter it (in your case, sum, add up, plus, what is needed)
3. Update data
1. Extract data
2. Alter it (in your case, sum, add up, plus, what is needed)
3. Update data