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Delete Duplicates (Save One From Each Group)

How To

Delete Duplicates (Save One From Each Group)

by  TheAceMan1  Posted    (Edited  )
To All . . . . .

A full amendment of the [blue]SQL[/blue] to perform this task has been made. Following are the steps to install this [blue]powerful[/blue] SQL!
[ol][li]Copy the following [blue]SQL[/blue] to a text editor so you can see better (WordPad would be great as you can maintain color of the tags). [blue]Your going to edit the SQL, and its important you maintain spacing and brackets where you see them.[/blue] [purple]One error here and it won't work![/purple]
Code: 
[blue]DELETE [[purple][b]DF[/b][/purple]]
FROM [[purple][b]TN[/b][/purple]]
WHERE [[purple][b]ID[/b][/purple]] Not In (SELECT Max([[purple][b]ID[/b][/purple]]) FROM [[purple][b]TN[/b][/purple]] GROUP BY [[purple][b]DF[/b][/purple]]);[/blue]
[/li]
[li]In the SQL you'll see three tags:
[ol a][li][purple]DF[/purple] is YourDuplicateFieldName[/li]
[li][purple]ID[/purple] is YourIDFieldName (usually the primarykey)[/li]
[li][purple]TN[/purple] is YourTableName[/li][/ol]
Parse thru the SQL and replace the tags with the proper names.[/li]
[li]When your sure your done, open a new query [blue]in design view[/blue] (do not select any tables) and copy/paste the SQL into [blue]SQL View[/blue] (be sure to paste over the [blue]Select;[/blue] that already there).[/li]
[li]Switch to [blue]DataSheet View[/blue] to test its working and view the records that will be deleted. [green]From here your ready to fly![/green][/li][/ol]
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