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SQL Statement to Update Rows on Condition

Posted on 2013-12-09
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Last Modified: 2013-12-09
I have duplicate rows in a table. All column values are equal except one numeric column.
I need to set a column value for the lowest Col3 value in each group.

Col1         Col2           Col3             Col4

1808      AA      30175130          1   Set Col4 to 0 for the min Col3 value of the AA Group
1808      AA      30176132          1
4450      AAN      30175454          1   Set Col4 to 0 for the min value of the AAN Group
8384      AAN      30175787          1
8385      AAN      30175788          1
4450      AAN      30177864          1
8384      AAN      30178679          1
8385      AAN      30178680          1

How can this be done?

Thanks,
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Question by:Dovberman
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Accepted Solution

by:
Jim Horn earned 500 total points
ID: 39706084
Give this a whirl... a JOIN on your_table (rename to suit your needs) and a subquery that gets the minimum value of Col3 based on the Col2 value.
UPDATE your_table
SET Col4 = 0
FROM your_table yt
   JOIN (SELECT Col2, Min(Col3) as Col3_min
            FROM your_table
            GROUP BY Col2) yt_min 
   ON yt.Col2 = yt_min.Col2 AND yt.Col3 = yt_min.Col3_min

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Author Comment

by:Dovberman
ID: 39706234
Thank you,

I will try this later today and reply.
0
 

Author Comment

by:Dovberman
ID: 39706532
Works perfectly,

Thanks,
0
 

Author Closing Comment

by:Dovberman
ID: 39706534
Works perfectly,

Thanks,
0

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