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Replacing empty rows in a field with values from another field

Question asked by vik624r on Mar 28, 2018
Latest reply on Mar 28, 2018 by Dan_Patterson

I want to add a value from "field_2" to "field_1" only if a row in "field_1" is empty, otherwise leave the value of "field_1".
What will be the query in field calculator?? I want to use this in ModelBuilder.

Thanks

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