Well, one way is to have a field in the table that has the date and time that record was last updated. You could find the latest one by using the DMax function and save that value in a variable. Then you would run your update query as usual making sure to store new values for the update date and time. Next, check the table again to see how many records have an update date and time greater than the variable you first stored.
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Greg Serrano
Michigan Dept. of Environmental Quality
Air Quality Division
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