ATAN (Transact-SQL)

THIS TOPIC APPLIES TO: yesSQL Server (starting with 2008)yesAzure SQL DatabaseyesAzure SQL Data Warehouse yesParallel Data Warehouse

Returns the angle in radians whose tangent is a specified float expression. This is also called arctangent.

Topic link icon Transact-SQL Syntax Conventions

Syntax

ATAN ( float_expression )  

Arguments

float_expression
Is an expression of the type float or of a type that can be implicitly converted to float.

Return types

float

Examples

The following example takes a float expression and returns the ATAN of the specified angle.

SELECT 'The ATAN of -45.01 is: ' + CONVERT(varchar, ATAN(-45.01))  
SELECT 'The ATAN of -181.01 is: ' + CONVERT(varchar, ATAN(-181.01))  
SELECT 'The ATAN of 0 is: ' + CONVERT(varchar, ATAN(0))  
SELECT 'The ATAN of 0.1472738 is: ' + CONVERT(varchar, ATAN(0.1472738))  
SELECT 'The ATAN of 197.1099392 is: ' + CONVERT(varchar, ATAN(197.1099392))  
GO  

Here is the result set.


-------------------------------   
The ATAN of -45.01 is: -1.54858                         

(1 row(s) affected)  

--------------------------------   
The ATAN of -181.01 is: -1.56527                         

(1 row(s) affected)  

--------------------------------   
The ATAN of 0 is: 0                                

(1 row(s) affected)  

----------------------------------   
The ATAN of 0.1472738 is: 0.146223                         

(1 row(s) affected)  

-----------------------------------   
The ATAN of 197.1099392 is: 1.56572                          

(1 row(s) affected)  

Examples: Azure SQL Data Warehouse and Parallel Data Warehouse

The following example takes a float expression and returns the arctangent of the specified angle.

SELECT ATAN(45.87) AS atanCalc1,  
    ATAN(-181.01) AS atanCalc2,  
    ATAN(0) AS atanCalc3,  
    ATAN(0.1472738) AS atanCalc4,  
    ATAN(197.1099392) AS atanCalc5;  

Here is the result set.

atanCalc1  atanCalc2  atanCalc3  atanCalc4  atanCalc5
---------  ---------  ---------  ---------  ---------
1.55       -1.57       0.00       0.15       1.57

See also

CEILING (Transact-SQL)
Mathematical Functions (Transact-SQL)