Thanks for your quick responce,
But it is not that easy. Maybe I need to be more specific i.e.:
Table A:
20091204, 9
20091215, 9
20091215, 10
20100105, 10
20091227, 11
20100124, 11
20100127, 12
20100131, 13
20100205, 14
and table B.
Workcenter
9
10
11
12
13
14
The problem is when you...