atan2(x, y): Returns the inverse tangent of the quotient of x and y : atan2 « Math Functions « PostgreSQL

1. PostgreSQL
2. Math Functions
3. atan2

atan2(x, y): Returns the inverse tangent of the quotient of x and y

postgres=#
postgres=# -- atan2(x, y): Returns the inverse tangent of the quotient of x and y
postgres=# SELECT atan2(0, 1), atan2(1, 1),
postgres-#        atan(0 / 1) AS functionally,
postgres-#        atan(1 / 1) AS identical;
 atan2 |       atan2       | functionally |     identical
-------+-------------------+--------------+-------------------
     0 | 0.785398163397448 |            0 | 0.785398163397448
(1 row)

postgres=#
           
       

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