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Hello Bryan, which version of PI OLEDB Enterprise are you using? If you are using v 2012, you could check that the value equals "No Result". See here:
Hidden and Excluded AF Attributes:
In PI OLEDB Enterprise 2012, both Hidden and Excluded attributes appear in query results. Excluded attributes will have a value of "No Result." When PI OLEDB Enterprise 2015 is released, Excluded attributes will not appear. Hidden attributes will appear and will be accompanied by a new boolean IsHidden column with a value of True.
Clayton, This seemed to work for me. Thank you for providing the solution.