Returns the arc-cosine, in radians, of a numeric expression.
ACOS( numeric-expression )
numeric-expression The cosine of the angle.
DOUBLE
This function converts its argument to DOUBLE, and performs the computation in double-precision floating-point arithmetic.
SQL/2008 Vendor extension.
The following statement returns the arc-cosine value for 0.52.
SELECT ACOS( 0.52 );