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From:Jeff Hill Date:April 13 1999 2:06pm
Subject:Re: delete duplicate
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On the same subject, how would you identify all records with a
duplicate/matching field?

I have users who register for access to my website, then forget
and register again. The only field that is definitely duplicated
is e-mail. I can't just delete the duplicate records; I need to
only list them and then contact the users.


Jeff Hill

Gerald Clark wrote:
> Xah Lee wrote:
> >
> > Suppose I have a table that has identical rows for some reason. I need to
> > delete the duplicates. Can this be done in MySql's SQL?
> >
> Here is one method that uses a temporary unique index to force deletion
> of duplicate records.
> alter ignore table tablename add unique( field1, field2, ... fieldx )
> When you are  through, drop the index MySQL created.
> ---------------------------------------------------------------------

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delete duplicateXah Lee13 Apr
Re: delete duplicateDon Read13 Apr
Re: delete duplicateGerald Clark13 Apr
Re: delete duplicateJeff Hill13 Apr
Re: delete duplicateGerald Clark16 Apr