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SQL Query

I really hope someone would help me. I had this query:

"Select distinct DVD.DVDid,Rent_Detail.RentNo,Title,Num_of_DVD,(get date()-RentDate)+1 As RentPeriod,(CASE WHEN RentPeriod>5 THEN (RentPeriod-5)*500 ELSE RentPeriod*0 END) As Fine From Member,Rental,DVD,Rent_Detail Where DVD.DVDid=Rent_Detail.DVDid And Rental.RentNo=Rent_Detail.RentNo And Member.MemberID=Rental.MemberID And Member.MemberID='" & ComboBox1.Text & "' AND Rent_Detail.DVDid='" & DGV1.Rows(e.RowIndex).Cells(0).Value & "' AND Rent_Detail.Num_of_DVD>0"

Now my question is, there are error saying that invalid column from 3 RentPeriods in CASE, but I use those just to create a column name "fine". Why is that?
Nov 15 '11 #1
3 1056
Rabbit
12,516 Expert Mod 8TB
You can't refer to a calculated field in the same SQL level in which it was created.
Nov 15 '11 #2
gpl
152 100+
In the case statement, replace 'rentperiod' by the definition of rentperiod from the previous column
Nov 16 '11 #3
keyword as must be in either lower or upper but not As.
Nov 16 '11 #4

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