FLOOR (Transact-SQL)

numeric_expression

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

Returns the same type as numeric_expression.

The following example shows positive numeric, negative numeric, and currency values with the FLOOR function.

SELECT FLOOR(123.45), FLOOR(-123.45), FLOOR($123.45)

The result is the integer part of the calculated value in the same data type as numeric_expression.

---------      ---------     -----------
123            -124          123.0000   

Reference