If you are implementing a database and find that you have duplicate keys, you cannot create a primary key until you eliminate the duplicates. If you have a lot of patience, see Knowledgebase article Q139444. If you just want to clean out the duplicates, then run this script. It takes a table name as an argument and deletes all records with duplicate keys.
For SQL Server 6.5
Author: Tom De Lancey
Download Script:
sp_deleteduplicatekeys.SQL
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