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SQL Update Criteria

Last Modified: 2012-05-09
I'm trying to create an update query that will update a table in Access. I want to flag all the records that have duplicate values in one of the columns. The flag will be a 'N' value in a corresponding column for a dupe record. I have two queries that I've been trying to make work together, but no luck so far.
To set the flag:
UPDATE tbl_os_reverse_save SET tbl_os_reverse_save.FILL = Left([tbl_os_reverse_save]![FILL],Len([tbl_os_reverse_save]![FILL])-1) & 'N'

To find the dupes:
SELECT First(tbl_os_reverse_save.[WHLSL AGIN]) AS [WHLSL AGIN Field], Count(tbl_os_reverse_save.[WHLSL AGIN]) AS NumberOfDups
FROM tbl_os_reverse_save
GROUP BY tbl_os_reverse_save.[WHLSL AGIN]
HAVING (((Count(tbl_os_reverse_save.[WHLSL AGIN]))>1))
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