atan2(1, 0), atan2(-1, 0), atan2(0, 0) : atan2 « Math Functions « PostgreSQL

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PostgreSQL » Math Functions » atan2   atan2(1, 0), atan2(-1, 0), atan2(0, 0) postgres=# SELECT atan2(1, 0) AS positive_x, postgres-#        atan2(-1, 0) AS negative_x, postgres-#        atan2(0, 0) AS zero_x, postgres-#        pi() / 2 AS pi_over_two;    positive_x    |    negative_x    | zero_x |   pi_over_two -----------------+------------------+--------+-----------------  1.5707963267949 | -1.5707963267949 |      0 | 1.5707963267949 (1 row) postgres=#                     Related examples in the same category 1.  atan2(x, y): Returns the inverse tangent of the quotient of x and y

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