SQL Server/T-SQL Tutorial/Math Functions/ABS

ABS function returns the absolute value of any number passed to it.

4>
5> SELECT SQRT(2.0*ABS(2000.0)*ABS(-8.0)/ABS(0.20))
6> GO
------------------------
                     400
(1 rows affected)

select ABS(-1.25)

4> select ABS(-1.25)
5> GO
-----
 1.25
(1 rows affected)