Thanks! This helped immensely. Below is the code that worked for me. feature class: WaterQuality point field: StationID Date field: SampleDate OBJECTID IN (SELECT OBJECTID FROM WaterQuality a JOIN (SELECT StationID, MAX(SampleDate) DATE FROM WaterQuality GROUP BY StationID) b ON a.StationID = b.StationID AND a.SampleDate = b.DATE
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