MySQL in a Nutshell

Name

ATAN2( )

Synopsis

SELECT ATAN(2);
   
+----------+
| ATAN(2)  |
+----------+
| 1.107149 |
+----------+

ATAN2(number, number)

This function returns the arc tangent in radians of X and Y for a point on a Cartesian plane. The value for Y is given as the first argument and X as the second. The reverse function is TAN( ).

SELECT ATAN2(10, 5);
+--------------+
| ATAN2(10, 5) |
+--------------+
|     1.107149 |
+--------------+