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SQL DISTINCT not working

Posted on 2013-12-05
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Last Modified: 2014-01-30
I have a query that I'm added ROW_NUMBER() to it, but when I try to add DISTINCT or GROUP BY it does not work.

Here is the query.

SELECT * FROM (SELECT ROW_NUMBER() OVER (ORDER BY fpacode) AS Rownumber, fpaCode, listname, fpaID, emailTo, status, cfid FROM fpaBasket WHERE cfid = 'D1W12978461') AS Sample WHERE Rownumber < 11

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Question by:Medrise
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8 Comments
 

Author Comment

by:Medrise
ID: 39698241
I need to group all fpaCode
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Assisted Solution

by:Jim Horn
Jim Horn earned 375 total points
ID: 39698249
ROWNUMBER adds a 1, 2, 3, ... to all rows.

Which means, the rows would by definition all become DISTINCT, which defeats the purpose of having DISTINCT in your query.

>I need to group all fpaCode
So if a specific ROWNUNBER has 4, 5, and 6 for fpaCode = 1, then which ROWNUMBER do you want returned in the single row for fpaCode = 1?
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Author Comment

by:Medrise
ID: 39698266
I want to add the ROW_NUMBER to this query, so should do a SELECT with ROW_NUMBER() with this query?

SELECT DISTINCT(fpaCode), listname, fpaID, emailTo, status, cfid FROM fpaBasket WHERE cfid = 'D1W12978461'

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Assisted Solution

by:Jim Horn
Jim Horn earned 375 total points
ID: 39698291
Please answer this question:
>I need to group all fpaCode
So if a specific ROWNUNBER has 4, 5, and 6 for fpaCode = 1, then which ROWNUMBER do you want returned in the single row for fpaCode = 1?
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Author Comment

by:Medrise
ID: 39698350
I can return ROWNUMBER 4 that would be fine...
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Assisted Solution

by:Jim Horn
Jim Horn earned 375 total points
ID: 39698473
So to clarify, you want to return the minimum ROWNUMBER value for a given grouping of fpaCode?

Example:

fpaCode  rownumber
1              1                  --say there are three rows with fpaCode = 1, but only one row is displayed here
2              4                  --say there are 13 rows with fpaCode = 2, but only one row is displayed here
3              17
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Expert Comment

by:awking00
ID: 39698558
Can you provide some sample data and your expected output?
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Accepted Solution

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PortletPaul earned 125 total points
ID: 39700339
If you want to "group all fpaCode" why are you using row_number()?
Do you mean something like this perhaps?
This would give you one row per fpaCode by using "partition by fpaCode"
SELECT TOP 10
      *
FROM (
            SELECT
                  ROW_NUMBER() OVER (PARTITION BY fpaCode ORDER BY cfid) AS Rownumber
                , fpaCode
                , listname
                , fpaID
                , emailTo
                , status
                , cfid
            FROM fpaBasket
            WHERE cfid = 'D1W12978461'
      ) AS Sample
WHERE Rownumber = 1

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Note while I have chosen to "order by cfid" but that is purely an arbitrary choice.
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