Force view

Question

Hello Guys,
Can you tell me what is the use of view when we create with FORCE option if underliying table is not available ?
CREATE OR REPLACE FORCE VIEW MY_VIEW AS SELECT * FROM EMP;
Now View My_View will be created even if the emp table is not available. But where we can use this view ?. What is the applicatin of My_View when we know that EMP table is not available ?.
Thanking you.

Answer 1

Simple demonstration...
SQL> create or replace view my_view as select * from empdept;
create or replace view my_view as select * from empdept
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> create or replace force view my_view as select * from empdept;
Warning: View created with compilation errors.
SQL> select * from my_view;
select * from my_view
ERROR at line 1:
ORA-04063: view "SCOTT.MY_VIEW" has errors
SQL> create table empdept as select ename, deptno from emp;
Table created.
SQL> select * from my_view;
ENAME          DEPTNO
SMITH              20
ALLEN              30
WARD
JONES              20
MARTIN             30
BLAKE
CLARK              10
SCOTT              20
KING               10
TURNER             30
ADAMS              20
JAMES              30
FORD               20
MILLER             10
14 rows selected.
SQL>