ATAN Function - SQL Server to PostgreSQL Migration

In SQL Server and PostgreSQL ATAN function returns arctangent.

SQL Server:

  -- Get arctangent
  SELECT ATAN(-45.01);
  # -1.54858269620627

PostgreSQL:

  -- Get arctangent
  SELECT ATAN(-45.01);
  # -1.5485826962062663

For more information, see SQL Server to PostgreSQL Migration.