[Webinar] Streamline your web hosting managementRegister Today

x
?
Solved

Deleting duplicate records in SQL

Posted on 2014-09-10
4
Medium Priority
?
135 Views
Last Modified: 2014-09-22
Experts,

Attached is the documents outlines the sample data and I want to delete the rows that are highlighted in red color. Have been trying with multiple scripts and not successful.

Thanks in advance
Document.docx
0
Comment
Question by:Tpaul_10
  • 2
4 Comments
 
LVL 4

Assisted Solution

by:rlarian
rlarian earned 1000 total points
ID: 40315943
INSERT INTO tablenew
      SELECT * FROM table tT
      WHERE NOT EXISTS (SELECT * FROM tablenew T
                                    WHERE      T.[ItemNumber] = tT.[ItemNumber] AND
                                                T.[ItemCode] = tT.[ItemCode])

tablenew can be a temp table. then truncate table and insert tablenew back into table.
0
 

Author Comment

by:Tpaul_10
ID: 40316007
Didn't get it quite right with the above code rlarian, how about the following query and gets me what I wanted. Can you please review?

Delete ItemDetails where itemId not in (
select min(itemID) from ItemDetails A
group by ItemNumber,ItemCode) 

Open in new window


Thanks
0
 
LVL 4

Expert Comment

by:rlarian
ID: 40316054
just tested. that'll work.
0
 
LVL 66

Accepted Solution

by:
Jim Horn earned 1000 total points
ID: 40316127
<air code>  
;with del as (
   SELECT ItemNumber, ItemCode, ItemID
      row_number() OVER (partition by ItemNumber, ItemCode ORDER BY ItemID) as row_number 
   FROM your_table
)
DELETE FROM del WHERE row_number > 1

Open in new window

Nice timing; I just wrote an article titled SQL Server Delete Duplicate Rows Solutions, so if you have some time to kill give this a read and let me know if you like it.  The above is modeled after the 'Delete #1' section.
0

Featured Post

Learn to develop an Android App

Want to increase your earning potential in 2018? Pad your resume with app building experience. Learn how with this hands-on course.

Question has a verified solution.

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

SQL Server engine let you use a Windows account or a SQL Server account to connect to a SQL Server instance. This can be configured immediatly during the SQL Server installation or after in the Server Authentication section in the Server properties …
How to leverage one TLS certificate to encrypt Microsoft SQL traffic and Remote Desktop Services, versus creating multiple tickets for the same server.
SQL Database Recovery Software repairs the MDF & NDF Files, corrupted due to hardware related issues or software related errors. Provides preview of recovered database objects and allows saving in either MSSQL, CSV, HTML or XLS format. Ensures recov…
Stellar Phoenix SQL Database Repair software easily fixes the suspect mode issue of SQL Server database. It is a simple process to bring the database from suspect mode to normal mode. Check out the video and fix the SQL database suspect mode problem.

591 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