Question

I have been struggling with the following problem for a long time.

I have an experience table like this

id | uid | positive | negative

uid – gains the experience

positive – is the experience positive?

negative – is the experience negative?

The user table look like this

id | username | password

But how can I count the net experience for a user? How can I determine if the net experience is positive or negative with a query?

Answer 1

SELECT uid, SUM(positive - negative) AS NetExp
FROM experience 
GROUP BY uid

This shows you the net experience per user.
What do you mean with collect it?