ATAN2() function

SELECT ATAN2( X,Y )

SELECT ATAN2(8,6); // Output is 0.927295218001612
SELECT ATAN2(0.1,0.3); // Output is 0.321750554396642
SELECT ATAN2(0,0); // Output is 0

Using ROUND() with ATAN2()

SELECT ROUND(ATAN2(5,6),2);// Ouput is 0.69
SELECT ROUND(ATAN2(-3,-8),2); // Ouput is -2.78
SELECT ROUND(ATAN2(9,-15),2); // Output is 2.60