SQL Server SQRT() Function

The SQL Server (Transact-SQL) SQRT() function returns the square root of a given number. In special cases it returns the following:

• If the number is a negative value, then an error is returned.

Syntax

SQRT(number)

Parameters

Return Value

Returns the square root of a given number.

Example 1:

The example below shows the usage of SQRT() function.

SELECT SQRT(2);
Result: 1.4142135623730951

SELECT SQRT(3);
Result: 1.7320508075688772

SELECT SQRT(10);
Result: 3.1622776601683795

SELECT SQRT(50);
Result: 7.0710678118654755

SELECT SQRT(100);
Result: 10

Example 2:

Consider a database table called Sample with the following records:

The statement given below can be used to calculate the square root of column x.

SELECT *, SQRT(x) AS SQRT_Value FROM Sample;

This will produce the result as shown below: