SQRT

声明

SQRT(X)

说明

返回 X 的平方根。

示例

SELECT SQRT(4);
+---------+
| SQRT(4) |
+---------+
|       2 |
+---------+
1 row in set (0.001 sec)

SELECT SQRT(5);
+------------------+
| SQRT(5)          |
+------------------+
| 2.23606797749979 |
+------------------+
1 row in set (0.001 sec)

SELECT SQRT(-16);
+-----------+
| SQRT(-16) |
+-----------+
|      NULL |
+-----------+
1 row in set (0.001 sec)