Solved

SQL Create a new table from a table with a unique combination of two colums

Posted on 2014-11-09
6
120 Views
Last Modified: 2014-11-14
Hi

I have a table called "MARA_MBEW3" that has two columns called ValA and Article. I tried to add a primary key
that combines the two columns Article and  [ValA] using the SQL syntax below but got the error further down
I now want to create a new table that chops out any records that have a duplicate of these two records. How do I do this

ALTER TABLE MARA_MBEW3
ADD CONSTRAINT pk_MARA_MBEW3 PRIMARY KEY (Article, [ValA])
GO

Msg 1505, Level 16, State 1, Line 1
The CREATE UNIQUE INDEX statement terminated because a duplicate key was found for the object name 'Siris1.MARA_MBEW3' and the index name 'pk_MARA_MBEW3'. The duplicate key value is (EI14528, C921).
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.
The statement has been terminated.
0
Comment
Question by:murbro
6 Comments
 
LVL 65

Accepted Solution

by:
Jim Horn earned 250 total points
ID: 40431575
DELETE 
FROM MARA_MBEW3 m
  JOIN (
      SELECT ValA, Article
      FROM YourTable
      GROUP BY ValA, Article
      HAVING COUNT(Article) > 1) dups ON m.ValA = dups.ValA AND m.Article = dups.Article

Open in new window

btw Might not be a bad idea to INSERT these into some kind of backup table, if for some reason you need them later.
0
 
LVL 24

Assisted Solution

by:chaau
chaau earned 250 total points
ID: 40431639
To create a new table without duplicates you can use the following statement:
with cte as (SELECT *, ROW_NUMBER() OVER(PARTITION BY ValA, Article) AS rn from MARA_MBEW3
)
SELECT * INTO newTable FROM cte WHERE rn = 1

Open in new window

If you wish to store the duplicate records for later analysis use this statement:
with cte as (SELECT *, ROW_NUMBER() OVER(PARTITION BY ValA, Article) AS rn from MARA_MBEW3
)
SELECT * INTO dupsTable FROM cte WHERE rn > 1

Open in new window

0
 
LVL 2

Expert Comment

by:alcindor
ID: 40431726
I may have misunderstood your question but would the following do the job ?

SELECT distinct ValA, Article
INTO NEWTABLE
from MARA_MBEW3
0
Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

 

Author Comment

by:murbro
ID: 40432006
Thanks Jim
I tried the following and got the error below
DELETE
FROM MARA_MBEW3 m
  JOIN (
      SELECT ValA, Article
      FROM m
      GROUP BY ValA, Article
      HAVING COUNT(Article) > 1) dups ON m.ValA = dups.ValA AND m.Article = dups.Article


Msg 102, Level 15, State 1, Line 2
Incorrect syntax near 'm'.
Msg 102, Level 15, State 1, Line 7
Incorrect syntax near 'dups'
0
 
LVL 24

Expert Comment

by:chaau
ID: 40432011
I hope you are taking the database backup. If you run Jim's query (by inserting m after the DELETE keyword) you will end up whit a table without the duplicate records. However, there where you had 2 duplicate records will be none. I assume you want to keep at least one record for each duplicate entries
0
 

Author Closing Comment

by:murbro
ID: 40444136
Thanks
0

Featured Post

Backup Your Microsoft Windows Server®

Backup all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

Question has a verified solution.

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

Nowadays, some of developer are too much worried about data. Who is using data, who is updating it etc. etc. Because, data is more costlier in term of money and information. So security of data is focusing concern in days. Lets' understand the Au…
Why is this different from all of the other step by step guides?  Because I make a living as a DBA and not as a writer and I lived through this experience. Defining the name: When I talk to people they say different names on this subject stuff l…
Familiarize people with the process of retrieving data from SQL Server using an Access pass-thru query. Microsoft Access is a very powerful client/server development tool. One of the ways that you can retrieve data from a SQL Server is by using a pa…
Via a live example, show how to setup several different housekeeping processes for a SQL Server.

863 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

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now