Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

ATAN function

ATAN is a trigonometric function that returns the arc tangent of a number. The return value is in radians and is between -PI and PI.

Syntax

ATAN(number)

Arguments

Return type

DOUBLE PRECISION

Examples

To return the arc tangent of 1 and multiply it by 4, use the following example.

SELECT ATAN(1) * 4 AS pi;
            
+-------------------+
|        pi         |
+-------------------+
| 3.141592653589793 |
+-------------------+

To convert the arc tangent of 1 to the equivalent number of degrees, use the following example.

SELECT (ATAN(1) * 180/(SELECT PI())) AS degrees;

+---------+
| degrees |
+---------+
|      45 |
+---------+