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RADIANS (Transact-SQL)

Applies To: SQL Server 2014, SQL Server 2016 Preview

Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).

Returns radians when a numeric expression, in degrees, is entered.

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database, Azure SQL Data Warehouse Public Preview.

Topic link icon Transact-SQL Syntax Conventions

RADIANS ( numeric_expression )

numeric_expression

Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type.

Returns the same type as numeric_expression.

A. Using RADIANS to show 0.0

The following example returns a result of 0.0 because the numeric expression to convert to radians is too small for the RADIANS function.

SELECT RADIANS(1e-307)
GO

Here is the result set.

------------------- 
0.0                      
(1 row(s) affected)

B. Using RADIANS to return the equivalent angle of a float expression.

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

-- First value is -45.01.
DECLARE @angle float
SET @angle = -45.01
SELECT 'The RADIANS of the angle is: ' +
   CONVERT(varchar, RADIANS(@angle))
GO
-- Next value is -181.01.
DECLARE @angle float
SET @angle = -181.01
SELECT 'The RADIANS of the angle is: ' +
   CONVERT(varchar, RADIANS(@angle))
GO
-- Next value is 0.00.
DECLARE @angle float
SET @angle = 0.00
SELECT 'The RADIANS of the angle is: ' +
   CONVERT(varchar, RADIANS(@angle))
GO
-- Next value is 0.1472738.
DECLARE @angle float
SET @angle = 0.1472738
SELECT 'The RADIANS of the angle is: ' +
    CONVERT(varchar, RADIANS(@angle))
GO
-- Last value is 197.1099392.
DECLARE @angle float
SET @angle = 197.1099392
SELECT 'The RADIANS of the angle is: ' +
   CONVERT(varchar, RADIANS(@angle))
GO

Here is the result set.

--------------------------------------- 
The RADIANS of the angle is: -0.785573                      
(1 row(s) affected)
--------------------------------------- 
The RADIANS of the angle is: -3.15922                       
(1 row(s) affected)
--------------------------------------- 
The RADIANS of the angle is: 0                              
(1 row(s) affected)
--------------------------------------- 
The RADIANS of the angle is: 0.00257041                     
 (1 row(s) affected)
--------------------------------------- 
The RADIANS of the angle is: 3.44022                        
(1 row(s) affected)
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