SQL Server ATN2() Function

Return the arc tangent of two values:

SELECT ATN2(0.50, 1);

Definition and Usage

The ATN2() function returns the arc tangent of two numbers.

ATN2(a, b)

Parameter	Description
a, b	Required. Two numeric values to calculate the arc tangent of

Works in:	SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse

Return the arc tangent of two values:

SELECT ATN2(-0.8, 2);