From: Michael Widenius
Date: April 12 1999 8:08am
Subject: Error 1022
List-Archive: http://lists.mysql.com/mysql/1688
Message-Id: <14097.43356.707718.622501@monty.pp.sci.fi>
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>>>>> "Robert" == Robert Pruitt <RPruitt@stripped> writes:

Robert> Hi!
Robert> I looked through the manual , but came up short.

Robert> Here's my problem -- I deleted a primary key. Later, I want to
Robert> reinitiate it. But, I get this error -- ERROR 1022: Can't write,
Robert> duplicate key in table 'A-cb'

Robert> I don't mean to bug the list with a beginner problem -- on the other
Robert> hand, I'm still stumped....

Hi!

Please repost with mysqlbug script + a full example of your problem,
including a full test that also shows any possible error messages.

We need more information about your MySQL version and OS to be able to
help you.

You can find information how to do a correct bug report at:

http://www.tcx.se/Manual_chapter/manual_Questions.html#Asking_questions

PLEASE read the above before reposting your question, this will save us all
a lot of time!

Sorry for the short answer, but as we get a couple of hundred mails/day
we don't have time to answer questions that are already documented
or doesn't contain all information needed to give a quick exact answer.

Yours,
Monty

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PS: If the above happens with ALTER TABLE, you can find the duplicate 
    key with:
    SELECT key_colum,count(*) as cnt from table_name GROUP BY
    key_column having cnt>1;