Syntax

SQRT(X)

Description

Returns the square root of X. If X is negative, NULL is returned.

Examples

SELECT SQRT(4);
+---------+
| SQRT(4) |
+---------+
|       2 |
+---------+

SELECT SQRT(20);
+------------------+
| SQRT(20)         |
+------------------+
| 4.47213595499958 |
+------------------+

SELECT SQRT(-16);
+-----------+
| SQRT(-16) |
+-----------+
|      NULL |
+-----------+

SELECT SQRT(1764);
+------------+
| SQRT(1764) |
+------------+
|         42 |
+------------+