Deleting specific record from nested table Oracle DB - oracle

Question

I'm having problems deleting specific record from the table (ORACLE DB).
I have a table with a nested table inside of it.
Table structure looks like this: where ML - nested table
Name, City, ML(Brand, Model, ID, Year, Price)
What I need to do is delete specific record with ID of 'L201'.
What I have tried so far:
SELECT B.ID FROM TABLE Dock A, Table(A.ML) B;
This is working giving me all the ID's.
Output:
ID
____
B201
S196
L201
This is not working when trying to delete the record:
DELETE FROM Dock
(SELECT B.ID FROM Dock A, Table(A.ML) B) C
WHERE C.ID = 'L201';
Getting error:
Line 2: SQL command not properly ended;
DELETE FROM TABLE
(SELECT D.ML FROM Dock D) E
WHERE E.ID = 'L201';
Throws an error:
single-row subquery returns more than one row

Answer 1

Maybe this one:
DELETE FROM
(SELECT A.Name, A.City, d.Brand, d.Model, d.ID, d.Year, d.Price
FROM Dock A, TABLE(ML) d)
WHERE ID = 'L201';
Update:
Another trial before we gonna make it more advanced:
DELETE FROM Dock
WHERE ROWID =ANY (SELECT a.ROWID FROM Dock a, TABLE(ML) b WHERE b.ID = 'L201');
Update 2:
If you prefer it more object-oriented, this one should work as well. At least I did not get any error.
CREATE OR REPLACE TYPE ML_TYPE AS OBJECT (
brand VARCHAR2(100),
ID VARCHAR2(20),
MODEL VARCHAR2(20),
YEAR NUMBER,
Price NUMBER,
MAP MEMBER FUNCTION getID RETURN VARCHAR2,
CONSTRUCTOR FUNCTION ML_TYPE(ID IN VARCHAR2) RETURN SELF AS RESULT);
CREATE OR REPLACE TYPE BODY ML_TYPE IS
CONSTRUCTOR FUNCTION ML_TYPE(ID IN VARCHAR2) RETURN SELF AS RESULT IS
-- Constructor to create dummy ML-Object which contains just an ID,
-- used for comparison
BEGIN
SELF.ID := ID;
RETURN;
END ML_TYPE;
MAP MEMBER FUNCTION getID RETURN VARCHAR2 IS
BEGIN
RETURN SELF.ID;
END getID;
END;
/
CREATE OR REPLACE TYPE ML_TABLE_TYPE IS TABLE OF ML_TYPE;
CREATE TABLE Dock (Name VARCHAR2(20), City VARCHAR2(20), ML ML_TABLE_TYPE)
NESTED TABLE ML STORE AS ML_NT;
insert into Dock values ('A', 'NY', ML_TABLE_TYPE(
ML_TYPE('brand1','L301','Model 2',2013, 1000),
ML_TYPE('brand2','L101','Model 3',2013, 1000)));
insert into Dock values ('B', 'NY', ML_TABLE_TYPE(
ML_TYPE('brand3','K301','Model 4',2014, 3000),
ML_TYPE('brand4','K101','Model 5',2014, 3000)));
insert into Dock values ('A', 'NY', ML_TABLE_TYPE(
ML_TYPE('brand5','K301','Model 8',2012, 2000),
ML_TYPE('brand6','L201','Model 9',2012, 2000)));
DELETE FROM Dock WHERE ML_TYPE('L201') MEMBER OF ML;

Answer 2

After reading some literature I think I found the correct way to do this.
By defining a mapping-function for your object-type you can compare two nested tables directly.
Example:
-- creating the custom object type
create or replace type ml_type as object (
brand varchar2(100),
id varchar2(20),
map member function sort_key return varchar2
);
-- creating the object type body and defining the map-function
create or replace type body ml_type as
map member function sort_key return varchar2 is
begin
return self.brand || '|' || self.id;
end;
end;
/
-- creating the nested table of custom type
create or replace type ml_tab as table of ml_type;
-- deleting from your table by comparing the nested-table elements
delete from dock where ml = (select ml from dock a, table(a.ml) b where b.id = 'L201');
In this example the map-functions is just returning the concatenated version of brand and id, but you can define it to what you want/need.