group by in gridview

Posted on 2007-11-30
Last Modified: 2008-02-01
hello, i ve got a gridview with this result:

Customer                CategoryID               Description
Jon Smith                     1                          First Classs - Best Service
Steve Smith                 1                           NULL
Paul Smith                    2                           NULL
Robert Smith                     2                           NULL
David Smith                     2                           NULL

NOw, i want to add another gridview nwxt to it with this result:

Category ID           Count(grouped by categoryID)
       1                         2
       2                         3

My question is.....could i use the same objectdatasource of the first grid to build the second??
What ive tried to do so far is pass the result of the first grid onto a dataview. Then, from the dataview use the 'ToTable method' to a new table. This way i can get the distinct values. But i cant get the count column.
 any ideas? do i have to create another query for this?
Question by:arcross
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Expert Comment

by:Oliver Amaya
ID: 20381268
Hi, I think that the best way would be to just use a query to your database, what I recommend is having both query's returned via a Stored Procedure, and store them in a DataSet, that way it would only be one trip and each query results would be stored in a different table of the DataSet.

Author Comment

ID: 20381521
thanks joex911 for yuor suggestion. This is the query ive got to return the count column:

SELECT COUNT(C.CategoryID),C.CategoryName FROM CatServices AS C
JOIN (SELECT CategoryID,CompanyName,Description  FROM Services WHERE
CompanyName LIKE '%%' OR
(Description LIKE '%%' AND NOT DESCRIPTION IS NULL)) AS TEST ON C.CategoryID = TEST.CategoryID
GROUP BY C.CategoryName

Can i pass a parameter in a stored procedure using the LIKE clause.??
eg: @MyFilter

SELECT ID FROM Table1 WHERE Field2 LIKE '%' + @MyFilter + '%'


Author Comment

ID: 20381653
I tried passing a parameter like the example above and it worked.
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LVL 10

Expert Comment

by:Oliver Amaya
ID: 20381697
I'm not sure but I believe this query should return the same results and avoids using a subquery:
SELECT COUNT(C.CategoryID),C.CategoryName FROM CatServices AS C
INNER JOIN Services S ON C.CategoryID = S.CategoryID
WHERE S.CompanyName LIKE '%%'
  OR (S.Description LIKE '%%' AND NOT S.Description IS NULL)
GROUP BY C.CategoryName

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Author Comment

ID: 20381788
yes it does joex. Thanks for that.

But is there a way to use an aggregate function using a datatable that uses grouping and counting?
LVL 10

Accepted Solution

Oliver Amaya earned 500 total points
ID: 20381838
DataTables support something called Column Expressions, where you define a DataColumn with a value derived from the other set of columns in the query, I've used them before but to concatenate fields, I found a link that says you can also add aggregate functions, but haven't tried it yet.
// Add OrderCount column to Customers table
tblCustomers.Columns.Add("OrderCount", typeof(int), "Count(Child(CustomerOrders).OrderId)");

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