Oracle PL/SQL Tutorial/Numerical Math Functions/ATAN

ATAN(1)

   <source lang="sql">

SQL> select ATAN(1) from dual;

  ATAN(1)

---

.785398163</source>

ATAN(-1) (2)

   <source lang="sql">

SQL> select ATAN(-1) from dual;

 ATAN(-1)

---

-.78539816</source>