The ATN2 function in SQL Server is a Mathematical Function which is used to return the angle between the positive x-axis and the line from the origin to the point (y, x).

## SQL ATN2 Function Syntax

In SQL Server, The basic syntax of the ATN2 Function is:

SELECT ATN2 (Float_Expression, Float_Expression) FROM [Source]

In this article we will show you, How to write or use ATN2 Function in SQL Server with example. For this, We are going to use the below shown data

## SQL ATN2 Function Example 1

The ATAN2 Function is used to find the Angle between the positive x-axis and the line from the origin to the point (y, x). Here the x and y values are the two argument we are going to provide for ATN2 Function. The following query will show multiple ways to use ATN2 function.

**T-SQL CODE**

DECLARE @i Float = 50.05, @j Float = 200.05 SELECT ATN2(@i, @j) AS [ATN2 Function] -- Calculating ATAN directly SELECT ATN2(100.27, 50.27) AS [ATN2 Function] -- Calculating ATAN directly SELECT ATN2(22.45 + 77.55, 100) AS [ATN2 Function]

**OUTPUT**

**ANALYSIS**

Below lines of code is used to declare two float variables and assigning the values.

DECLARE @i Float = 50.05, @j Float = 200.05

In the below statement, We used ATN2 function to find the angle between those two variables @i and @j. We also assigned new name to that result as ‘ATN2 Function’ using ALIAS Column.

SELECT ATN2(@i, @j) AS [ATN2 Function]

In the next statements, We used the ATN2 Functions directly on the float values. For instance below statement will find the angle between the values 100 (22.45 + 77.55), 100

-- Calculating ATAN directly SELECT ATN2(22.45 + 77.55, 100) AS [ATN2 Function]

## SQL ATN2 Function Example 2

In this example, We are going to calculate the Angle between the values present in [Standard Cost] and [Sales Amount] using ATAN Function.

**T-SQL CODE**

SELECT [EnglishProductName] ,[Color] ,[StandardCost] ,[SalesAmount] ,ATN2([StandardCost], [SalesAmount]) AS [ATN2 Function] FROM [Mathemetical Functions]

**OUTPUT**

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