atan2
description
Syntax
DOUBLE atan2(DOUBLE y, DOUBLE x)
返回 'y' / 'x' 的反正切.
example
mysql> select atan2(0.1, 0.2);
+---------------------+
| atan2(0.1, 0.2) |
+---------------------+
| 0.46364760900080609 |
+---------------------+
mysql> select atan2(1.0, 1.0);
+---------------------+
| atan2(1.0, 1.0) |
+---------------------+
| 0.78539816339744828 |
+---------------------+keywords
ATAN2