I need Something like this:
+-------+------+---------+
| id | soll | haben |
+-------+------+---------+
| 1 | 5 | 4 |
| 2 | 7 | 3 |
| 3 | 9 | 4 |
| 4 | 5 | 2 |
+-------+------+---------+
| | total| total |
| | 26 | 13 |
--------------------------
total_soll(26)-total_haben(13) = new field(13)
how can i do that?
Please help me
thanks