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SQL ATAN Function

by suresh

The SQL ATAN function is a Mathematical Function, which calculates the trigonometry Arc tangent for the specified expression. The SQL Arc tangent also called the inverse of a TANGENT Function. The syntax of the SQL Server ATAN Function is

SELECT ATAN (Float_Expression)
FROM [Source]

For this ATAN Function demo, we use the below-shown data

SQL ATAN FUNCTION

SQL ATAN Function Example 1

The ATAN function calculates the Arctangent value for the given angle. The following query shows multiple ways to use the ATAN function.

DECLARE @i Float
SET @i = -208.80

SELECT ATAN(@i) AS [Arc Tangent]

-- Calculating ATAN directly
SELECT ATAN(0.27) AS [Arc Tangent]

-- Calculating ATAN directly
SELECT ATAN(22.25 + 78.55 - 140.77) AS [Arc Tangent]

OUTPUT

SQL ATAN FUNCTION 1

ANALYSIS

We used the ATAN Mathematical Function to calculate the Arc TANGENT value for the variable @i. It means ATAN(-208.80)), and assigned a new name ‘Arc Tangent’ usingĀ ALIAS.

SELECT TAN(@i) AS [SQL Tangent]

ATAN Function Example 2

We are going to calculate the Arctangent value for all the records present in [Service Grade] using this SQL Serve Function

SELECT [EnglishProductName]
      ,[Color]
      ,[StandardCost]
      ,[SalesAmount]
      ,[Service Grade] AS Grade
      ,ATAN([Service Grade]) AS [Arc Tangent] 
  FROM [Mathemetical Functions]

OUTPUT
SQL ATAN FUNCTION 2

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