It's confusing that you say that your alphanumeric column contains "strictly numeric" values, but asking about a non-numeric value like '0A0'. If this is a hexadecimal value that you're storing, you would need to write a UDF (user-defined function) to convert the column to a numeric value. If the column truly contains numeric values, you could change the range check to INTEGER(alphanum_column) BETWEEN 0 AND 999999999.
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