PostgreSQL atan2d() Function

The PostgreSQL atan2d() function returns the arc tangent of the result of the division of two specified numbers, in degrees.

atan2d() Syntax

This is the syntax of the PostgreSQL atan2d() function:

atan2d(x, y)

Parameters

x

Required. The dividend.

y

Required. The divisor.

Return value

The PostgreSQL atan2d(x, y) function returns the arc tangent of the result of the division of two specified numbers, in degrees.

If the parameter number is NULL, the atan2d() function will return NULL.

atan2d() Examples

Here are a few examples of the atan2d() function:

SELECT
    atan2d(1, 0) AS "atan2d(1, 0)",
    atan2d(1, 2) AS "atan2d(1, 2)",
    atan2d(0, 1) AS "atan2d(0, 1)";

-[ RECORD 1 ]+-------------------
atan2d(1, 0) | 90
atan2d(1, 2) | 26.565051177077986
atan2d(0, 1) | 0

atan2d(x, y) is equivalent to atand(x / y), for example:

SELECT
    atan2d(1, 2) AS "atan2d(1, 2)",
    atand(0.5) AS "atand(0.5)";

-[ RECORD 1 ]+-------------------
atan2d(1, 2) | 26.565051177077986
atand(0.5)   | 26.565051177077986

Here, we found that atan2d(1, 2) and atand(0.5) returned the same result.

atan2d(x, y) is equivalent to calculating atan2(x, y) first and then converting the result to degrees using degrees(), for example:

SELECT
    atan2d(1, 0) AS "atan2d(1, 0)",
    degrees(atan2(1, 0)) AS "degrees(atan2(1, 0))";

-[ RECORD 1 ]--------+---
atan2d(1, 0)         | 90
degrees(atan2(1, 0)) | 90