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SQL Code to flatten out records

Posted on 2009-04-02
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Last Modified: 2013-11-25
I have a table sitting in SQL Server. I have a need to "flatten out" a table.  Here is my basic table

Date            Person      Prize1      Prize2      Prize3
1/1/2009 11:01:02      Bill      Item1      Item2      Item3
1/1/2009 11:05:23      Bill      Item4      NULL      NULL
I need to manipulate the data so Bill is just one record. A 4th field would need to be added to the output. I dont care about the timestamp. The new record would just have a value of 1/1/2009.  Would need sql code to do this.

Result set would be:
Date             Person    Prize1     Prize2   Prize3   Prize4
1/1/2009      Bill           Item1       Item2     Item3     Item4
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Question by:d1cjm1ex
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6 Comments
 
LVL 31

Expert Comment

by:RiteshShah
ID: 24051282
what if second record also have prize1,2 and 3 along with 4, should first record need to be overwritten?
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Accepted Solution

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Scott Pletcher earned 2000 total points
ID: 24051606
SELECT Person, CONVERT(CHAR(8), Date, 112),
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize1 ELSE '' END) AS Prize1,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize2 ELSE '' END) AS Prize2,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize3 ELSE '' END) AS Prize3,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN '' ELSE Prize1 END) AS Prize4
FROM tablename
GROUP BY Person, CONVERT(CHAR(8), Date, 112)
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LVL 70

Expert Comment

by:Scott Pletcher
ID: 24051649
CORRECTION: Forgot to put the day back into a date format:


SELECT Person, CAST(CONVERT(CHAR(8), Date, 112) AS DATETIME) AS Date,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize1 ELSE '' END) AS Prize1,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize2 ELSE '' END) AS Prize2,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize3 ELSE '' END) AS Prize3,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN '' ELSE Prize1 END) AS Prize4
FROM tablename
GROUP BY Person, CAST(CONVERT(CHAR(8), Date, 112) AS DATETIME)
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Author Comment

by:d1cjm1ex
ID: 24051907
The first record should not be overwritten.  Additional columns would need to be added to the output to include all prizes.
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Author Comment

by:d1cjm1ex
ID: 24053983
Your solution does create the result set I gave as an example, however I guess I should have been a bit clearer....I need this to be a bit more dynamic in that the NULL values in the second record could contain actual values (Prize 6, etc).  If I add the value "Item6" in the second record for the Prize2 column, the result set is no longer correct.

For a given day for a given person, I need to create one record that has all the Prize values. Each record can have a max of 3 prizes.  The second (or third or fourth)  record may only have one prize value or it could have 2 or 3.
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LVL 70

Expert Comment

by:Scott Pletcher
ID: 24060190
Ooh, yeah, I misunderstood -- that requirement's going to be considerably more complicated :-) .
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