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Field Calculation Between Two Feature Classes

Question asked by Youngy on Oct 2, 2013
Latest reply on Oct 8, 2013 by Youngy
I have a feature class containing two summed values (two attributes). I need to find out if one is less than or more than 20% of the other.
Is it possible to field calculate this in the same feature class? I have tried to export to two separate feature classes but cannot see a tool to call different fields from different feature classes in the same calculation.
Thanks in advance,