Answer / m arun kumar

FORCE
The FORCE option of the CREATE VIEW statement can be used
to create the object even if one of the underlying objects
(i.e. referenced within the view) do not exist.

This can be useful if the views are created before the
underlying objects in creation scripts etc.
/* Try to create a view against a table which does not
exist */

SQL> CREATE OR REPLACE VIEW test_view
2 AS
3 SELECT * FROM non_existent_table;
SELECT * FROM non_existent_table
*
ERROR at line 3:
ORA-00942: table or view does not exist

/* Hence, the view does not exists */

SQL> SELECT * FROM test_view;
SELECT * FROM test_view
*
ERROR at line 1:
ORA-00942: table or view does not exist

/* Specifying FORCE creates the view object (albeit with
errors) */

SQL> CREATE OR REPLACE FORCE VIEW test_view
2 AS
3 SELECT * FROM non_existent_table;

Warning: View created with compilation errors.

/* Trying to SELECT from the view implies it's been created
*/

SQL> SELECT * FROM test_view;
SELECT * FROM test_view
*
ERROR at line 1:
ORA-04063: view "ORAUSER.TEST_VIEW" has errors

/* Creating the missing object then allows us to select
from it */

SQL> CREATE TABLE non_existent_table
2 (
3 a VARCHAR2(10)
4 );

Table created.

SQL> SELECT * FROM test_view;

no rows selected

Answer / suresh

the view can be created without base table then the view is
called force view. the view must be crated with force option.

Answer / dinesh kumar

Force View creates view even if the base table is not
available.

if a table is getting updated what happens if a function is called from sql query?

2 Answers   RBS,

---

Why partition by is used in sql?

0 Answers  

---

What are inner and outer joins examples of both?

0 Answers  

---

What are the 3 modes of parameter?

0 Answers  

---

HOW TO ADD PRIMARY KEY TO TABLE BY PL/SQL PROGRAM

3 Answers  

---

---

When are we going to use truncate and delete?

0 Answers  

---

Is a foreign key always unique?

0 Answers  

---

Types of optimization?

6 Answers   Microsoft,

---

discuss about myisam index statistics collection. : Sql dba

0 Answers  

---

Where is all the data on the internet stored?

0 Answers  

---

what is the difference between implicit conversions and explicit conversions?

2 Answers  

---

What is dialect in sql?

0 Answers  

---