SQRT

Description

Returns the square root of a value, where the input value must be greater than or equal to 0.

Syntax

SQRT(<x>)

Parameters

Parameter	Description
<x>	The value whose square root is to be calculated

Return Value

The square root of parameter x.

Special Cases

• When x equals 0, returns 0
• When x equals -0, returns -0
• When x is less than 0, returns NULL
• When x is NaN, returns NaN
• When x is positive infinity, returns Infinity
• When x is negative infinity, returns NULL
• When x is NULL, returns NULL

Examples

select sqrt(9), sqrt(2);

+-------------------------+-------------------------+
| sqrt(cast(9 as DOUBLE)) | sqrt(cast(2 as DOUBLE)) |
+-------------------------+-------------------------+
|                     3.0 |      1.4142135623730951 |
+-------------------------+-------------------------+

select sqrt(1.0);

+------------+
| sqrt(1.0)  |
+------------+
|          1 |
+------------+

select sqrt(0.0);

+------------+
| sqrt(0.0)  |
+------------+
|          0 |
+------------+

select sqrt(-0.0);

+-------------+
| sqrt(-0.0)  |
+-------------+
|          -0 |
+-------------+

select sqrt(-1.0);

+-------------+
| sqrt(-1.0)  |
+-------------+
|        NULL |
+-------------+

select sqrt(cast('nan' as double));

+---------------------------+
| sqrt(cast('nan' AS DOUBLE)) |
+---------------------------+
| NaN                       |
+---------------------------+

select sqrt(cast('inf' as double));

+---------------------------+
| sqrt(cast('inf' AS DOUBLE)) |
+---------------------------+
| Infinity                  |
+---------------------------+

select sqrt(cast('-inf' as double));

+----------------------------+
| sqrt(cast('-inf' AS DOUBLE)) |
+----------------------------+
| NULL                       |
+----------------------------+