Subtracts one value from another.
byte? SUBTRACT(byte? a, byte? b)
short? SUBTRACT(short? a, short? b)
int? SUBTRACT(int? a, int? b)
long? SUBTRACT(long? a, long? b)
Single? SUBTRACT(Single? a, Single? b)
double? SUBTRACT(double? a, double? b)
double? SUBTRACT(double? a, decimal? b)
decimal? SUBTRACT(decimal? a, double? b)
decimal? SUBTRACT(decimal? a, decimal? b)
SUBTRACT(12, 9)
Will return '3'.