help required for a update scenario - response (5) by sujiwarrier

Thanks Kiani,
But here I have multile customer groups to be checked before updating the daily data. Like in above example we have one customer group with C1,C2 and C3 in which C1 is the customer which is like primary customer. Now if we have another customer group as C4 and C5 which will also flow through the daily data. In the second customer group if C4 is the primary , then we have to check for C4 in daily data do the same logic for C5 customer as well.
So same update query should work for multiple customer groups. We can even have lookup table which holds the customer groups , but difficult part to maintain the same update query.
Can you please chek if its possible.