Question

I have a table, the data in it looks similar to this:

user  type       hours    used    --to make another column with this info    available

2334  sick       10.000   2.000                                              8.000
2334  vacation   48.000   56.000                                             -8.000
2334  personal   0        8.000                                              0
1356  sick       0        16.000                                             -16.000
1356  vacation   80.000   0                                                  80.000
1356  personal   14.000   14.000                                             0
4355  sick       4.000    1.000                                              3.000
4355  vacation   112.000  0                                                  112.000 
4355  personal   8.000    0                                                  8.000

I had to sum up the values in the hours column, but only for each user. So user 2334 would have earned 58.000 hours, 10.000 + 48.000 + 0 but would have used 66.000 hours resulting in -8.000 hours.

Answer 1

SELECT user, SUM(hours) totalHours
FROM tableName
GROUP BY user

• SEE SQLFiddle Demo