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atan2

Description​

Returns the arc tangent of x divided by y, that is, the arc tangent of x/y. The signs of the two parameters are used to determine the quadrant of the result.

The return value is in the range of [-π, π].

Syntax​

ATAN2(x,y);

Parameters​

x: The supported data type is DOUBLE.

y: The supported data type is DOUBLE.

Return value​

Returns a value of the DOUBLE type. Returns NULL if x or y is NULL.

Examples​

mysql> select atan2(-0.8,2);
+---------------------+
| atan2(-0.8, 2)      |
+---------------------+
| -0.3805063771123649 |
+---------------------+
1 row in set (0.01 sec)