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Message Posted: Wed, 09 Dec 2009 @ 16:59:07 GMT

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Row_Number() in Teradata is a window aggregate function. As such, you need to provide it a "window", so to speak.

     UPDATE database.table
     SET MyRowId = ROW_NUMBER() OVER (ORDER BY )
     ;

You could also partition by a set of fields as well if you want the Row_Number to restart after a group of fields values change:

     UPDATE database.table
     SET MyRowId = ROW_NUMBER() OVER (PARTITION BY  ORDER BY
     )
     ;

Hope this helps. There is more information available about using window aggregate functions in the Teradata Manuals.

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