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Returns the arc tangent of the two variables x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result. ATAN(y, x) is a synonym for ATAN2(y, x).

func.atan2( <y, x> )
func.atan2((- 2), 2)
┌─────────────────────┐
│ func.atan2((- 2), 2)│
├─────────────────────┤
-0.7853981633974483
└─────────────────────┘
ATAN2( <y, x> )
SELECT ATAN2(-2, 2);
┌─────────────────────┐
atan2((- 2), 2) │
├─────────────────────┤
-0.7853981633974483
└─────────────────────┘