Using Alias in query resulting in “command not properly ended”

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Oracle does not support table alias with the as.

For example:

SQL> select 1
  2  from dual as a;
from dual as a
             *
ERROR at line 2:
ORA-00933: SQL command not properly ended


SQL> select 1
  2  from dual a;

         1
----------
         1

The same way: 

SQL> select *
  2  from (
  3        select 1 from dual
  4       ) as a;
     ) as a
          *
ERROR at line 4:
ORA-00933: SQL command not properly ended


SQL> select *
  2  from (
  3        select 1 from dual
  4       )  a;

         1
----------
         1

Column alias can be both with and without the as:

SQL> select 1 as one, 2 two
  2  from dual;

       ONE        TWO
---------- ----------
         1          2

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