If you don't care what the values are, why don't change all of them in SCAN loop starting wit 1?

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>Say I have a table that has column MY_INT_FLD I(4). There could be some records in this table that have the same value in this field. And some records that have 0 in this field. I want to create one or two (or maybe even three) UPDATE command(s) that will set each record of this table to a unique value and it has to be greater than 0. Is it possible? TIA.