expression - Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. ...

expression - Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type.
expression_scale - Specifies the number of digits to the right of the decimal point that will be returned. The value for expression_scale must be an integer between 0 to 15 inclusive. When expression_scale is 0, an integer is returned. The rounding method is round to even. If the digit to the right of last digit to be retained is 5, the closest even number is returned, as shown in the following example.