Adding query to the view

Question

Hi,
I'll appreciate your advice regarding the following:
I am using a View which consists of several UNION statements.
for example:
create or replace view VI_TEST
as
select name,lname from Test1
union all
select name,lname from Test2
The questions is: if I am getting a new table, Test3, and want to include it in VI_TEST view - do I have any option (using PL/SQL or other) to make this addition incrementally? (not doing "create or replace view" again but adding the query of Test3)
Thanks

Answer 1

Here's the main idea. Hope you get the gist:
-- create some tables and data:
SQL> create table test_1 as select 'test_1' data from dual
Table created.
SQL> create table test_2 as select 'test_2' data from dual
Table created.
-- the pipelined function
SQL> create or replace function view_pipe return sys.dbms_debug_vc2coll pipelined
as
  data_col sys.dbms_debug_vc2coll;
begin
  for c in (select * from user_tables where table_name like 'TEST_%') loop
    execute immediate 'select * from ' || c.table_name bulk collect into data_col;
    for i in 1..data_col.count loop
     pipe row(data_col(i));
    end loop;
  end loop;
  return;
end view_pipe;
Function created.
-- a view based on the pipelined function
SQL> create or replace view v_myview as select substr(column_value,1,7) my_data from table(view_pipe)
View created.
SQL> select * from v_myview
MY_DATA
test_1
test_2
2 rows selected.
-- add another »entity«
SQL> create table test_3 as select 'test_3' data from dual
Table created.
-- data is appended in orginal view:
SQL> select * from v_myview
MY_DATA
test_1
test_2
test_3