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Nested Query Problem

Posted on 2009-05-05
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Last Modified: 2012-05-06
The nested COUNT query does not recognize a.CustomerID, it comes up asking for that. What am I doing wrong?
INSERT INTO ltblPIFItems(CustomerID, BusinessUnit, ItemID, LastActivity, NumberOfOtherItems, DebtType) 
SELECT a.CustomerID, a.BusinessUnit, a.ItemID, a.LastActivity, b.NumberOfOtherItems, a.DebtType 
FROM ltblAllItems a, (SELECT COUNT(*) - 1 AS NumberOfOtherItems FROM ltblAllItems c WHERE a.CustomerID = c.CustomerID) AS b 
WHERE a.Balance = 0

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Question by:bejhan
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3 Comments
 
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Accepted Solution

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Guy Hengel [angelIII / a3] earned 400 total points
ID: 24309618
change to this:
INSERT INTO ltblPIFItems(CustomerID, BusinessUnit, ItemID, LastActivity, NumberOfOtherItems, DebtType) 
SELECT a.CustomerID, a.BusinessUnit, a.ItemID, a.LastActivity
, (SELECT COUNT(*) - 1 AS NumberOfOtherItems FROM ltblAllItems c WHERE a.CustomerID = c.CustomerID) 
, a.DebtType 
FROM ltblAllItems a
WHERE a.Balance = 0

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Author Comment

by:bejhan
ID: 24309635
Nice I didn't know you could just do that. Thanks!
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24309654
you could have done like this:
INSERT INTO ltblPIFItems(CustomerID, BusinessUnit, ItemID, LastActivity, NumberOfOtherItems, DebtType) 
SELECT a.CustomerID, a.BusinessUnit, a.ItemID, a.LastActivity
, b.NumberOfOtherItems 
, a.DebtType 
FROM ltblAllItems a
INNER JOIN ( SELECT CustomerID, COUNT(*) - 1 AS NumberOfOtherItems 
              FROM ltblAllItems c 
            GROUP BY CustomerID 
           ) b
  ON (a.CustomerID = c.CustomerID)
WHERE a.Balance = 0

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