Question

How to check for duplicate records in a table?

Asked by: geeta_m9

I have a table S with the columns a, b, c, d, e and counter which are all part of the primary key. However, I believe that the counter column is redundant and does not need to belong in the primary key because columns a, b, c, d, and e should be sufficient to avoid duplicate records.

How do I write a query to check if there are any duplicate records in the table S, without the counter column?

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Asked On
2009-09-15 at 17:34:37ID24734924
Tags

Oracle SQL

Topic

Oracle CRM

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: AanvikPosted on 2009-09-15 at 17:38:49ID: 25340879

This query should give you duplicate records.

select Count(1), A , B, C, D, E from MyTable 
Group by A,B,C,D,E
Having Count(1) > 1 

                                              
1:
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3:

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by: Sharath_123Posted on 2009-09-15 at 18:13:36ID: 25341027

Another way

SELECT * 
  FROM (SELECT A,B,C,D,E,ROW_NUMBER() OVER (PARTITION BY A,B,C,D,E ORDER BY COUNTER) RN
          FROM YourTable) T1
  WHERE RN <> 1
                                              
1:
2:
3:
4:

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by: geeta_m9Posted on 2009-09-16 at 09:05:51ID: 25347135

Aanvik, your solution works perfectly. Thank you.

 

by: geeta_m9Posted on 2009-09-16 at 09:06:15ID: 25347142

Sarath_123, I get a syntax error when I try to execute your command.

 

by: geeta_m9Posted on 2009-09-16 at 09:06:53ID: 31629224

Thank you!!

 

by: Sharath_123Posted on 2009-09-16 at 11:02:09ID: 25348281

The syntax of my query is absolutely correct. May be your version of Oracle does not support row_number() function.
FYI - Aanvik's solution is suffieicnt for you. My query is another way of implementing the same using row_number() function.

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