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ATN2 (Transact-SQL)

Returns the angle, in radians, between the positive x-axis and the ray from the origin to the point (y, x), where x and y are the values of the two specified float expressions.

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.

Topic link icon Transact-SQL Syntax Conventions

ATN2 ( float_expression , float_expression )

float_expression

Is an expression of the float data type.

The following example calculates the ATN2 for the specified x and y components.

DECLARE @x float = 35.175643, @y float = 129.44;
SELECT 'The ATN2 of the angle is: ' + CONVERT(varchar,ATN2(@x,@y ));
GO

Here is the result set.

The ATN2 of the angle is: 0.265345                       
(1 row(s) affected)
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