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Finding Difference between two text fields

Question asked by whj68 on Mar 6, 2014
Latest reply on Mar 6, 2014 by rfairhur24
I have two fields (text) which have the land use of two different years but the area is same...Now i want to calculate the difference in a new field....How can i do that....
PS:I tried with field calculator (-) command but nothing happens...

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