How to select with multicast

Question

If I define a type of object and create a view using it:
+++++++++
create view v1 as
select cast(multiset(select
m.name as mName,
m.id as mId
from mtable m as mlist) mlst
from sometable
+++++++++
is it possible for me to select the above view by using the where statement on the mName or mId?
I try this and did not work:
select * from v1 where mlst(mName) = 'a'
What should the syntax be?
Thanks.

Answer 1

Check the view (VIEW1) definition. Anyway, since I do not know your data here is a complete set of code that will work.
DESC USER_OBJECTS Name            Null?    Type
OBJECT_NAME              VARCHAR2(128)
SUBOBJECT_NAME           VARCHAR2(30)
OBJECT_ID                NUMBER
DATA_OBJECT_ID           NUMBER
OBJECT_TYPE              VARCHAR2(19)
CREATED                  DATE
LAST_DDL_TIME            DATE
TIMESTAMP                VARCHAR2(19)
STATUS                   VARCHAR2(7)
TEMPORARY                VARCHAR2(1)
GENERATED                VARCHAR2(1)
SECONDARY                VARCHAR2(1)
create or replace view my_view as   2      select * from user_objects
  3  /
View created.
create or replace type my_type as object (  2       OBJECT_NAME      VARCHAR2(128),
  3       SUBOBJECT_NAME   VARCHAR2(30),
  4       OBJECT_ID        NUMBER,
  5       DATA_OBJECT_ID   NUMBER,
  6       OBJECT_TYPE      VARCHAR2(19),
  7       CREATED          DATE,
  8       LAST_DDL_TIME    DATE,
  9       TIMESTAMP        VARCHAR2(19),
10       STATUS           VARCHAR2(7),
11       TEMPORARY        VARCHAR2(1),
12       GENERATED        VARCHAR2(1),
13       SECONDARY        VARCHAR2(1)
14   )
15  /
Type created.
create or replace type my_tbl_type as table of my_type  2  /
Type created.
declare  2     my_array    my_tbl_type := my_tbl_type();
  3  begin
  4     select my_type(OBJECT_NAME, SUBOBJECT_NAME, OBJECT_ID, DATA_OBJECT_ID, OBJECT_TYPE,
  5                    CREATED, LAST_DDL_TIME, TIMESTAMP, STATUS, TEMPORARY, GENERATED, SECONDARY)
  6       bulk collect into my_array
  7       from user_objects
  8      where object_type = 'TABLE';
  9  end;
10  /
PL/SQL procedure successfully completed.