Solved

SQL Statement to Update Rows on Condition

Posted on 2013-12-09
4
254 Views
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,
0
Comment
Question by:Dovberman
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
4 Comments
 
LVL 66

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

Open in new window

0
 

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

Featured Post

Turn Insights into Action

Communication across every corner of your business is essential to increase the velocity of your application delivery and support pipeline. Automate, standardize, and contextualize your communication processes with xMatters.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The Delta outage: 650 cancelled flights, more than 1200 delayed flights, thousands of frustrated customers, tens of millions of dollars in damages – plus untold reputational damage to one of the world’s most trusted airlines. All due to a catastroph…
This article shows gives you an overview on SQL Server 2016 row level security. You will also get to know the usages of row-level-security and how it works
Using examples as well as descriptions, and references to Books Online, show the documentation available for date manipulation functions and by using a select few of these functions, show how date based data can be manipulated with these functions.
Via a live example, show how to extract information from SQL Server on Database, Connection and Server properties

717 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question