SQRT (Transact-SQL)

Artikel
03/09/2024

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric

Returns the square root of the specified float value.

Transact-SQL syntax conventions

Syntax

syntaxsql

SQRT ( float_expression )

Arguments

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

Return Types

float

Examples

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

SQL

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

Here's the result set.

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

Examples: Azure Synapse Analytics and Analytics Platform System (PDW)

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

SQL

SELECT SQRT(1.00), SQRT(10.00);

Here's the result set.

----------  ------------  
1.00        3.16

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