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SQL Server 2005 Distinct On One Column

Posted on 2010-09-02
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Last Modified: 2012-10-24
I need to write a query to display distinct values. Here is the scenario:

I have a Store table and a StoreSpecials table. In the Store table I have the following columns StoreID, StoreName, ParentID. In the StoreSpecials table I have the following columns StoreID and SpecialID. The ParentID equals 0 if the store is a prent and equals the ID StoreID of the parent for child stores. In the StoreSpecials table there can be many SpecialIDs for a group of stores. here is some sample data:

Store table
ID      Name         ParentID
287   Safeway   0
343   Safeway   287
526   Safeway   287

StoreSpecials table
StoreID   SpecialID
287         1
287         2
343         1
343         2
343         3
526         1
526         2
526         4

I need a query that displays the distinct SpecialIDs where the distinct SpecialIDs display for the parent instead of the children in the case where the same SpecialID is spread across multiple StoreIDs.

Thanks, Erich Lemke

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Question by:elemke
5 Comments
 
LVL 70

Expert Comment

by:Éric Moreau
ID: 33590600
can you show a sample of your expected output?
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LVL 16

Expert Comment

by:vdr1620
ID: 33590685
Try This

SELECT distinct Id,SpecialID
FROM Store S INNER JOIN StoreSpecials SS
ON S.Id = SS.StoreId
WHERE S.ParentId = 0
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Author Comment

by:elemke
ID: 33590869
Based on the sample data above the expected out would be:

StoreID   SpecialID   ParentID
287         1               0
287         2               0
343         3               287
526         4               287
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LVL 59

Accepted Solution

by:
Kevin Cross earned 250 total points
ID: 33591968
Try with row_number() windowing function and over() analytical clause.
;WITH specialsCTE
AS
(
SELECT sp.StoreID, sp.SpecialID, st.ParentID
     , ROW_NUMBER()
          OVER(PARTITION BY sp.SpecialID, 
               COALESCE(NULLIF(st.ParentID, 0), sp.StoreID)
               ORDER BY st.ParentID, sp.StoreID) rn
FROM Store st
JOIN StoreSpecials sp ON sp.StoreID = st.ID
)
SELECT StoreID, SpecialID, ParentID
FROM specialsCTE
WHERE rn = 1
;

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Expert Comment

by:Kevin Cross
ID: 33591975
For an explanation of the above, please read this article: Analytical SQL : Where do you rank?
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