ACCESS 2010 Update always updates the Update_Date

I'm running an Update query in Access 2010. EVen if there are no changes to data it will update the UPDATE_DATE with the current date and time. Is there some checksum I can use so this will only truly happen if data changes?

Code is

UPDATE tbl_Clients AS C INNER JOIN Audit_MasterClient AS A ON C.VisionClientID = A.[Vision Client Id]
SET
C.VisionClientID = A.[Vision Client Id], ClientName = A.[Client Name],
C.ParentCompany = IIf (A.[Parent Company] IS NULL,A.[Client Name],A.[Parent Company]),
C.BusinessSubLine = A.[Business Sub Line], C.SensitivityRating = A.[Sensitivity Rating], C.SensitivityratingReason = A.[Sensitivity Rating Reason],
C.RelationshipManager = A.[Relationship Manager], C.ClientAdvocate = A.[Client Advocate], C.ClientServicesDH = A.[Client Services DH],
C.CAM = A.CAM, C.RSDeptHead = A.[RS Dept Head], C.CRA = A.CRA, C.ERISAConsultant = A.[ERISA Consultant], C.TotalAssets = A.[Total Assets],
C.SiebelID = A.[Siebel ID], C.UserID = UCASE([txtUserID]), C.UpdateTS = NOW();
Chuck LoweAsked:
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mankowitzCommented:
The last line of your query is

C.UpdateTS = NOW()

If you don't want it to update, then leave that out.

One (very lengthy) way to do that is something like the following

UPDATE table SET
A=NewValueForA,
B=NewValueForB,
C=NewValueForC,
UpdateTS = NOW()
WHERE
(A IS NULL OR A<>NewValueForA) OR
(B IS NULL OR B<>NewValueForB) OR
(C IS NULL OR C<>NewValueForC)
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
>Is there some checksum I can use so this will only truly happen if data changes?
I don't see a WHERE clause in your query, so as written it will UPDATE all rows.
If you wish to limit this to only rows where the data changed, you'll have to add something like...

WHERE 
   c.VisionClientID <> a.[Vision Client Id] OR 
   c.ClientName <> a.[Client Name] OR 
   c.YouGetTheIdea <> a.[You Get the idea]

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Chuck LoweAuthor Commented:
@mankowith,@jim
Thanks guys. I'm from a mainframe background and we never need to check for this. It's an automatic checksum against the records.
Thanks again.
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