MySQL SQRT() Function

The MySQL 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 NULL is returned.

Syntax

SQRT(number)

Parameters

number Required. Specify the number. Must be a non-negative value.

Return Value

Returns the square root of a given number.

Example 1:

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

mysql> SELECT SQRT(2);
Result: 1.4142135623730951

mysql> SELECT SQRT(3);
Result: 1.7320508075688772

mysql> SELECT SQRT(10);
Result: 3.1622776601683795

mysql> SELECT SQRT(50);
Result: 7.0710678118654755

mysql> SELECT SQRT(100);
Result: 10

mysql> SELECT SQRT(-1);
Result: NULL

Example 2:

Consider a database table called Sample with the following records:

Data	x
Data 1	0.5
Data 2	1
Data 3	5
Data 4	10
Data 5	50

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:

Data	x	SQRT_Value
Data 1	0.5	0.7071067811865476
Data 2	1	1
Data 3	5	2.23606797749979
Data 4	10	3.1622776601683795
Data 5	50	7.0710678118654755

❮ MySQL Functions