| Subtype | Usage | | POSITIVE | Allows only positive integers to be stored, up to the maximum of 2,147,483,647. Zero is not considered a positive number, and so is not an allowed value. | | NATURAL | Allows only natural numbers to be stored, which includes zero. Allowed values are 0, 1, 2, 3, and so on up to the maximum of 2,147,483,647. | | POSITIVEn | Like POSITIVE but cannot be null. | | NATURALn | Like NATURAL but cannot be null. | | SIGNTYPE | Restricts a variable to only the values -1, 0, and 1. |
|