Order and Group the same query

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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Richie4236Asked:
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Aneesh RetnakaranDatabase AdministratorCommented:
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

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pssandhuCommented:
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
j_s_kelleyCommented:
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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awking00Information Technology SpecialistCommented:
See attached.
query.txt
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BrightApolloCommented:
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.

--#
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BrightApolloCommented:
This is weird, the accepted answer doesn't limit to 20 rows, it just rewrites the SQL syntax to execute.
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Richie4236Author Commented:
The question / post was mainly about grouping and ordering, as the title suggests.  The answer I accepted fixed my problem.
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