ATN2 (Transact-SQL)
Applies to:
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
SQL analytics endpoint in Microsoft Fabric
Warehouse in Microsoft Fabric
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.
Transact-SQL syntax conventions
Syntax
ATN2 ( float_expression , float_expression )
Note
To view Transact-SQL syntax for SQL Server 2014 (12.x) and earlier versions, see Previous versions documentation.
Arguments
float_expression
An expression of data type float.
Return types
float
Examples
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(@y, @x));
GO
Here is the result set.
The ATN2 of the angle is: 1.30545
(1 row(s) affected)
See also
CAST and CONVERT (Transact-SQL)
float and real (Transact-SQL)
Mathematical Functions (Transact-SQL)
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