SQRT (Transact-SQL)
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
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.
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.
SELECT SQRT(1.00), SQRT(10.00);
Here's the result set.
---------- ------------
1.00 3.16