Issue of views

Hi all

I created a view like this

Create view V1 in select * from EMP;

After that, I added a column for the EMP table.

Now, if I select view, V1, this new column shows or not... ?

I checked, it does not show. I want to confirm this with the experts here.

Thank you
PAL

No reviews will NOT display the new extra column added because of a reason. See here,

SQL> create table t( a number, b number);

Table created.

SQL> create view t_view as select a from t;

View created.

SQL> drop view t_view;

View dropped.

SQL> create view t_view as select * from t;

View created.

SQL> select text from  user_views where view_name='T_VIEW';

TEXT
--------------------------------------------------------------------------------
select "A","B" from t

SQL> select * from t_view;

no rows selected

SQL> desc t_view;
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 A                                                  NUMBER
 B                                                  NUMBER

SQL> alter table t add(c number);

Table altered.

SQL> select text from  user_views where view_name='T_VIEW';

TEXT
--------------------------------------------------------------------------------
select "A","B" from t

You can see that even though I used select *, Oracle this converted to a list of columns. This list will not be updated even if you add the new column in the table. To add the new column, you must re-create the view.
HTH
Aman...

Tags: Database

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