I have a table tblMain with fields PID, PName, Check (Here the Check value is True/False)
tblMain
PID PName Check
1 X True
2 Y True
3 Z False
I have another table tblChange with fields PID,RID,Month,Value
tblChange
PID RID Month Value
1 1 1/1/2008 3
1 2 2/1/2008 4
2 1 1/1/2008 5
2 2...