Hello,
maybe I can not not see the forest for the trees ... or it is realy difficult.
I have a table like:
-> tblPerformance
P_ID | P_Date | Performance
------------------------------
1 | 01.01.2010 | 1,03
2 | 02.01.2010 | 1,05
3 | 04.01.2010 | 0,98
4 | 05.01.2010 |...