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Deleting dup emails

Author

Topic

helixpoint
Constraint Violating Yak Guru

291 Posts

Posted - 2011-06-07 : 16:27:57

I have a table that has an ID(Unique),email
I want to delete all duplicate emails. How do I do this?

Dave
Helixpoint Web Development
http://www.helixpoint.com

Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2011-06-07 : 17:18:31

There are a bunch of ways, here is one:

DELETE A
FROM
(
    SELECT *, ROW_NUMBER() OVER (PARTITION BY email ORDER BY ID) AS RowNum
    FROM <Tablename>
) AS A
WHERE RowNum > 1

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