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SQL Update with nested select and aggregate function

Posted on 2008-06-12
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Last Modified: 2008-06-13
I'm trying to update one column of a table with the following query:

UPDATE Utable
Set Amt =
   (SELECT
        Sum(Amt)
    FROM Ptable
    WHERE ID IN
        (SELECT ID FROM UTable)
    GROUP BY
        ID,
        Col1,
        Col2,
        Col3
    )

I'd like the sum of AMT from Ptable to be placed in Utable  but I keep getting various error messages -- can I do this in one update statement -- How would I do it?
   
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Question by:dkcoop03
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3 Comments
 
LVL 8

Accepted Solution

by:
i2mental earned 1000 total points
ID: 21772287
I'm going to assume that Ptable has multiple rows to each Utable ID.

UPDATE Utable
set utable.amt = (select sum(amt) from Ptable where ptable.id = utable.id)
0
 

Author Comment

by:dkcoop03
ID: 21778165
I have one question regarding this solution -- why doesn't  the nested select with the Sum(amt) require a group by clause?
0
 

Expert Comment

by:crobledo
ID: 31817188
MS SQL:

Can I work a query as such

Max(Count(field1), Count(field2), Count(field3))  AS thisField

In other words can I easily nest aggregate function
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