To display the duplicate records in sql server

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I have a table named "WorkingGroupSchoolContact" with fields "SchoolID" and "ContactID".
Now we have quite number of duplicate entries in the field "ContactID". We can have duplicate entries of the "ContactID" for the same "SchoolID" but the same "ContactID" should be present for two or more different "SchoolID". Now I have to filter data based on the condition. Can anyone please help me to perform this operation.

Posted 21-Aug-15 1:22am

user 3008

Updated 21-Aug-15 1:35am

v2

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Advay Pandya · Answer 1 · 2015-08-21T02:59:00

Solution 1

Hello,

Please try below query:

SQL

select ContactID,SchoolID,COUNT(ContactID) as DuplicateNumbers from WorkingGroupSchoolContact
group by ContactID,SchoolID
Having COUNT(ContactID) > 1

This query will return all the duplicate records in the combination of ContactID and SchoolID.

Please let me know if you have any concern or query on this or if I am missing something.

Thanks

Posted 21-Aug-15 2:59am

Advay Pandya

Updated 21-Aug-15 4:18am

v2

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user 3008 21-Aug-15 9:55am

Thank you so much for your response.

what is the UserId? Where did you declare that?

Advay Pandya 21-Aug-15 10:17am

Ohh Sorry, It's my column name. Let me edit that. Please check now