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SQRT (Transact-SQL)

Returns the square root of the specified float value.

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.

Topic link icon Transact-SQL Syntax Conventions

SQRT ( float_expression )

float_expression

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

The following example returns the square root of numbers between 1.00 and 10.00.

DECLARE @myvalue float;
SET @myvalue = 1.00;
WHILE @myvalue < 10.00
   BEGIN
      SELECT SQRT(@myvalue);
      SET @myvalue = @myvalue + 1
   END;
GO

Here is the result set.

------------------------ 
1.0                      
------------------------ 
1.4142135623731          
------------------------ 
1.73205080756888         
------------------------ 
2.0                      
------------------------ 
2.23606797749979         
------------------------ 
2.44948974278318         
------------------------ 
2.64575131106459         
------------------------ 
2.82842712474619         
------------------------ 
3.0

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