The PL/SQL data types PLS_INTEGER and BINARY_INTEGER are identical. For simplicity, this document uses PLS_INTEGER to mean both PLS_INTEGER and BINARY_INTEGER.
The PLS_INTEGER data type stores signed integers in the range -2,147,483,648 through 2,147,483,647, represented in 32 bits.
The PLS_INTEGER data type has these advantages over the NUMBER data type and NUMBER subtypes:
?PLS_INTEGER values require less storage.
?PLS_INTEGER operations use hardware arithmetic, so they are faster than NUMBER operations, which use library arithmetic.
For efficiency, use PLS_INTEGER values for all calculations in its range.
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