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I unioned two sets of data having 38 fields each. One has 592 records and the other has 946 records. The union of the two gives me 1538 records which is perfect BUT it also gives me 40 fields instead of 38 with two fields repeated. I put select tools in front of the input tables and checked that the data type is exactly the same. Any idea why it might be repeating and what I can do differently to solve it?