SQL集合嵌套表varray

DECLARE
   TYPE list_of_name_t IS TABLE OF person.first_name%TYPE INDEX BY PLS_INTEGER;
   happyfamily list_of_name_t;
   l_row PLS_INTEGER;
BEGIN
   happyfamily (200002) :='Eli';
   happyfamily (-1507) :='Steven';
   happyfamily (-90): 'Chris';
   happyfamily (88) :='Veva';
  
   l_row := happyfamily.FIRST;
   WHILE (l_row IS NOT NULL)
   LOOP 
   DBMS_OUTPUT.PUT_LINE(happyfamily (l_row));
   l_row := happyfamily.NEXT(l_row);
  END LOOP;
END;

----
CREATE TYPE list_of_names_t IS TABLE OF VARCHAR2(100)
/

DECLARE
    happyfamily list_of_names_t := list_of_names_t ();
    children  list_of_names_t := list_of_names_t ();
    parents list_of_names_t ;=list_of_namess_t();
BEGIN
    happyfamily.EXTEND(3);
    happyfamily (1) :='Eli';
    happyfamily (2) :='Steven';
    happyfamily (3) :='Chris';
   
    children.EXTEND;
    children (1) :='Chris';
    children.EXTEND;
    children (2) :='Eli';    

    parents :=happyfamily MULTISET EXCEPT children;

    FOR l_row IN parents.FIRST .. parents.LAST
    LOOP
        DBMS_OUTPUT.PUT_LINE(parents (l_row));
    END LOOP;
END;

--------

CREATE TYPE first_names_t IS VARRAY (2) OF VARCHAR2 (100);
/
CREATE TYPE child_names_t IS VARRAY (1) OF VARCHAR2 (100);
/
CREATE TABLE family (
   surname VARCHAR2(1000)
  ,parent_names first_names_t
  ,children_names child_names_t
);


DECLARE
   parents first_names_t := first_names_t ();
   children child_names_t := child_names_t ();
BEGIN
   parents.EXTEND (2);
   parents (1) :='Samuel';
   parents (2) :='Charina';
   
   children.EXTEND;
   children (1) :='Feather';

   INSERT INTO family ( surname, parents_names,children_names )
          VALUES('Assurty',parents,children);
END;

SELECT * FROM family;