Basically--it's a struct containing a byte array, weight, scale, and sign, and all the arithmetic operations are implemented in software. So it's really slow, a

Basically--it's a struct containing a byte array, weight, scale, and sign, and all the arithmetic operations are implemented in software. So it's really slow, and each RDBMS has to implement this type from scratch, or find a vendor lib that provides a suitable one, because C/C++ standard libraries don't provide one.