How can I edit the columns in an existing view - sql

Question

I have a view with a typo:
CREATE OR REPLACE VIEW "USER"."VW_X" AS (
SELECT id,
name,
decode(WRONG_COLUMN, 1, 'T', 0, 'F') AS problem
FROM "USER"."TEST");
For some reason using
CREATE OR REPLACE VIEW "USER"."VW_X" AS (
SELECT id,
name,
decode(RIGHT_COLUMN, 1, 'T', 0, 'F') AS problem
FROM "USER"."TEST");
results in the following message:
Error starting at line : 5 in command -
CREATE OR REPLACE VIEW "USER"."VW_X" AS (
SELECT id,
name,
decode(RIGHT_COLUMN, 1, 'T', 0, 'F') AS problem
FROM "USER"."TEST")
Error report -
SQL Error: ORA-02449: unique/primary keys in table referenced by foreign keys
02449. 00000 - "unique/primary keys in table referenced by foreign keys"
*Cause: An attempt was made to drop a table with unique or
primary keys referenced by foreign keys in another table.
*Action: Before performing the above operations the table, drop the
foreign key constraints in other tables. You can see what
constraints are referencing a table by issuing the following
command:
SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "tabnam";
I didn't even know that a view was a valid target for a reference. So here's the problem:
SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "USER"."VW_X";
returns nothing, this:
SELECT a.table_name,
a.column_name,
a.constraint_name,
c.owner,
c.r_owner,
c_pk.table_name r_table_name,
c_pk.constraint_name r_pk,
c.status
FROM all_cons_columns a
JOIN all_constraints c
ON a.owner = c.owner AND a.constraint_name = c.constraint_name
JOIN all_constraints c_pk
ON c.r_owner = c_pk.owner AND c.r_constraint_name = c_pk.constraint_name
WHERE c_pk.table_name = 'VW_X' or c.table_name = 'VW_X';
(a variant on the top answer to this post)
returns four constraints all of which with a status of 'DISABLED'.
I have looked into ALTER VIEW (the name sounded pretty promising), but it does not appear to be what I'm looking for.
Any suggestions?
NOTE: It is possible probable that there are some syntax errors in the provided sample code. These are mockups, in the interest of simplicity and out of professional paranoia, about a dozen irrelevant columns have been removed and names have been altered.
EDIT:
this is Oracle11g
EDIT:
The solution I found was
-- drop view.
DROP VIEW "USER"."VW_X" CASCADE CONSTRAINTS;
commit;
-- create view.
CREATE OR REPLACE VIEW "USER"."VW_X" AS (
SELECT id,
name,
decode(RIGHT_COLUMN, 1, 'T', 0, 'F') AS problem
FROM "USER"."TEST");
commit;
CASCADE CONSTRAINTS appears to be the missing link. I am pretty sure the constraints are lost, but I don't particularly care.

Answer 1

ALTER VIEW
AS
SELECT
[new column name] = wrongcolumn

Answer 2

Here is a solution that would drop the FK, create the view, then recreate the FK
-- create view with unique constraint
create or replace view v_foo
(id unique disable novalidate, val)
as
select id, val from foo;
-- create second view
create or replace view v_bar
(id, val)
as
(select id, val from bar);
-- add FK to second view
alter view v_bar
add constraint v_bar_ref
foreign key (id) references v_foo(id)
disable novalidate;
-- add a column, this fails b/c of FK constraint
create or replace view v_foo
(id unique disable novalidate, val, dummy)
as
select id, val, 1 from foo;
-- remove constraint
alter view v_bar
drop constraint v_bar_ref;
-- make changes to view
create or replace view v_foo
(id unique disable novalidate, val, dummy)
as
select id, val, 1 from foo;
-- recreate FK constraint
alter view v_bar
add constraint v_bar_ref
foreign key (id) references v_foo(id)
disable novalidate;