qry not updateable error

I have created a query using a find duplicates query based on [mvris code]. I want to update the variantdiff column to true. access wont let me and I am not sure how to achieve this
UPDATE TblSMMTDataDifferences RIGHT JOIN [Find duplicates for TblSMMTDataDifferences] ON TblSMMTDataDifferences.[MVRIS CODE] = [Find duplicates for TblSMMTDataDifferences].[MVRIS CODE Field] SET TblSMMTDataDifferences.variantDiff = True
WHERE ((([Find duplicates for TblSMMTDataDifferences].[MVRIS CODE Field]) Is Not Null));

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PeterBaileyUkAsked:
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JoeNuvoConnect With a Mentor Commented:
Sorry, the one I given in for SQL
try this one, it should working on Access

UPDATE TblSMMTDataDifferences
SET variantDiff = True
WHERE [MVRIS CODE] NOT IN (
	SELECT [MVRIS CODE Field]
	FROM [Find duplicates for TblSMMTDataDifferences] 
)

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JoeNuvoCommented:
you can't JOIN at the UPDATE command
it must join at FROM clause

anyway, I think your code can be like this

UPDATE TblSMMTDataDifferences
SET variantDiff = True
WHERE NOT EXISTS (
	SELECT [MVRIS CODE Field]
	FROM [Find duplicates for TblSMMTDataDifferences] 
	WHERE TblSMMTDataDifferences.[MVRIS CODE] = [Find duplicates for TblSMMTDataDifferences].[MVRIS CODE Field]
)

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PeterBaileyUkAuthor Commented:
its asking for a parameter TblSMMTDataDifferences.MVRIS CODE

something not quite right
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PeterBaileyUkAuthor Commented:
its working in a sense but the results are not correct its trying to update all the rows in the table
there are twelve [mvris code field] in the duplicate query which means there are 24 rows in the main query as the dups have only two rows each.
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PeterBaileyUkAuthor Commented:
done it the sql should read in and not not in
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JoeNuvoCommented:
Sorry (again).
I mistaken your given query "IS NOT NULL" with "IS NULL"
that why my query become NOT IN, instead of IN.

Anyway, you already figure it out :)
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PeterBaileyUkAuthor Commented:
amended version is:
UPDATE TblSMMTDataDifferences SET TblSMMTDataDifferences.variantDiff = True
WHERE (((TblSMMTDataDifferences.[MVRIS CODE]) In (SELECT [MVRIS CODE Field]
	FROM [Find duplicates for TblSMMTDataDifferences] 
)));

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