A mathematical function that returns the absolute (positive) value of the specified numeric expression.
The following example shows the results of using the ABS function on three different numbers.
SELECT ABS(-1.0), ABS(0.0), ABS(1.0);
Here is the result set.
---- ---- ---- 1.0 .0 1.0
The ABS function can produce an overflow error when the absolute value of a number is greater than the largest number that can be represented by the specified data type. For example, the int data type can hold only values that range from -2,147,483,648 to 2,147,483,647. Computing the absolute value for the signed integer -2,147,483,648 causes an overflow error because its absolute value is greater than the positive range for the int data type.
DECLARE @i int; SET @i = -2147483648; SELECT ABS(@i); GO
Here is the error message:
"Msg 8115, Level 16, State 2, Line 3"
"Arithmetic overflow error converting expression to data type int."