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Query for top 5 within every group

Posted on 2009-04-02
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Last Modified: 2013-11-28
I have a totals query with 3 fields: Region, Product, and AverageQty. I want a query that will only return the top 5 AverageQty within each region.

I can't recall ever using the drop down in a query to return the top 5. When I try it for this query I only get the top 5 records for a query. What else needs to be done to the query?
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Question by:dlogan7
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6 Comments
 
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by:sreindl04
ID: 24054587
which database system you are working with?
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by:dlogan7
ID: 24054618
I'm sorry. I thought I posted this to the Access section. I am using Access 2007.
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sreindl04 earned 250 total points
ID: 24054796
I was thinking on hierachies in oracle sqlplus but in Access... Use VBA and SELECT TOP might help...

The only idea I have is using unions if you know the regions in advance (see sql example)
SELECT TOP 3 Region, Product, AvgQuantity 
FROM Tabelle1
WHERE region = 1
ORDER BY 3 DESC
UNION
SELECT TOP 3 Region, Product, AvgQuantity
FROM Tabelle1
WHERE region = 2
ORDER BY 3 DESC

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Assisted Solution

by:koutny
koutny earned 250 total points
ID: 24058168
I don't know whether a solution is still required but the query might look something like the code snippet below.
The only problem with that query would be that in case there would be several products with the same averages then the query would show them all - it basically shows all products for each region with averages in the top 5.

I don't know where you are using this query but if you are trying to produce a report then there are other ways of achieving this (subreports).
SELECT R.RegionID, R.RegionName, RA.Product, RA.AverageQty
FROM Regions R INNER JOIN queryRegionAverages RA 
ON R.RegionID = RA.RegionID
 
WHERE 
RA.AverageQty in (SELECT TOP 5 AverageQty FROM queryRegionAverages RA2 WHERE RA.RegionID = RA2.RegionID ORDER BY RA2.queryRegionAverages DESC)
 
ORDER BY R.RegionID, RA.AverageQty DESC

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Expert Comment

by:sreindl04
ID: 24068836
The point with the "same" averages prevented me from providing an sql with subselects. You might work with subsubselects but I do not know if access supports this kind of queries and the performance impact might be high. Access does not scale very well with subselects especially when working on shares.
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