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I am trying to find the difference of 11 feet or more between two fields (Both are Double types). For example, I have a field called shape_length and another field called station_length and I want to see if there are any differences of 11 feet or more between the two, and select those differences. I think it's a simple SQL statement in the "Select By Attributes dialog in ArcGIS but I can't figure it out.

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In your Select by Attributes you could enter something like

abs(shape_length - station_length) > 11

which will select any feature where the difference between the two values is greater than 11. The abs is for "absolute value" so makes it a positive value for assessing against the 11.

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