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Order and Group the same query

Posted on 2009-06-30
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Last Modified: 2012-05-07
I'm trying to create a query which provides me with a list of the top 20 suppliers of our company.  This information is stored in an MSSQL database.

I can count the number of orders against each supplier and list them by using group.  I would then like to order this descending, so I see the top 20 suppliers and limit it so the others are disguarded.

As soon as I add the order function I get an error.

Can anyone tell me where I'm going wrong?

Thanks
SELECT     CardCode, COUNT(*) AS POs
FROM         OPOR
WHERE     (DocDate >= '06/01/2009') AND (DocDate <= '06/30/2009')
ORDER BY POs DESC
GROUP BY CardCode

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Question by:Richie4236
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7 Comments
 
LVL 75

Accepted Solution

by:
Aneesh Retnakaran earned 500 total points
ID: 24746629
SELECT     CardCode, COUNT(*) AS POs
FROM         OPOR
WHERE     (DocDate >= '06/01/2009') AND (DocDate <= '06/30/2009')
GROUP BY CardCode
ORDER BY POs DESC
0
 
LVL 17

Expert Comment

by:pssandhu
ID: 24746632
SELECT CardCode, COUNT(*) AS POs
FROM OPOR
WHERE (DocDate >= '06/01/2009') AND (DocDate <= '06/30/2009')
GROUP BY CardCode
ORDER BY COUNT(*) DESC
0
 
LVL 4

Expert Comment

by:j_s_kelley
ID: 24746661
Orber by goes after the Group By.  In fact, Order By really should be the last thing in a query.  It can't exist in a subquery or a group by operation.  The only way you can use order by in a sub query is if you are using the TOP modifier.
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So you’ve realized you might want to get certified in OpenStack, but you’re not sure what the benefits might be or even which one you should take. You know there are several certification courses you can choose from, but how do you know which one is right for you?

 
LVL 32

Expert Comment

by:awking00
ID: 24748022
See attached.
query.txt
0
 
LVL 3

Expert Comment

by:BrightApollo
ID: 24751127
Here's a portable ANSI solution.

SELECT o1.CardCode, COUNT(o1.*) AS POs
FROM OPOR o1
WHERE (SELECT COUNT(o2.*) as POs FROM OPOR o2
              WHERE o1.POs > o2.POs
               AND o2.DocDate >= '06/01/2009' AND o2.DocDate <= '06/30/2009') < 21
WHERE o1.DocDate >= '06/01/2009' AND o1.DocDate <= '06/30/2009'
ORDER BY POs DESC

At this point if you wanted to group the results you can use the above as a table query.

--#
0
 
LVL 3

Expert Comment

by:BrightApollo
ID: 24756469
This is weird, the accepted answer doesn't limit to 20 rows, it just rewrites the SQL syntax to execute.
0
 

Author Comment

by:Richie4236
ID: 24758763
The question / post was mainly about grouping and ordering, as the title suggests.  The answer I accepted fixed my problem.
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