>>-ATAN2--(--expression--,--expression--)----------------------><
The schema is SYSFUN.
Returns the arctangent of x and y coordinates as an angle expressed in radians. The x and y coordinates are specified by the first and second arguments respectively.
The first and the second arguments can be of any built-in numeric data type. Both are converted to a double-precision floating-point number for processing by the function.
The result of the function is a double-precision floating-point number. The result can be null; if any argument is null, the result is the null value.