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ACOS (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).

A mathematical function that returns the angle, in radians, whose cosine is the specified float expression; also called arccosine.

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

ACOS ( float_expression )

float_expression

Is an expression of the type float or of a type that can be implicitly converted to float, with a value from -1 through 1. Values outside this range return NULL and report a domain error.

The following example returns the ACOS of the specified number.

SET NOCOUNT OFF;
DECLARE @cos float;
SET @cos = -1.0;
SELECT 'The ACOS of the number is: ' + CONVERT(varchar, ACOS(@cos));

Here is the result set.

--------------------------------- 
The ACOS of the number is: 3.14159 

(1 row(s) affected)
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