Fetching cursor data into array in PL/SQL - sql

Question

I have a problem at one exercise: I have a table with an ussualy column, and another column which is another table, like this:
CREATE OR REPLACE TYPE list_firstnames AS TABLE OF VARCHAR2(10);
then I create the following table:
CREATE TABLE persons (last_name VARCHAR2(10), first_name list_firstnames)
NESTED TABLE first_name STORE AS lista;
I insert:
INSERT INTO persons VALUES('Stewart', list_firstnames('John', 'Jack'));
INSERT INTO persons VALUES('Bauer', list_firstnames('Helen', 'Audrey'));
INSERT INTO persons VALUES('Obrian', list_firstnames('Mike', 'Logan'));
I want to make a cursor to take all last and first names from persons, and then I want to put all of them in an array. After this, I want to count the first names which contains the 'n' letter.
First of all, I want to know how I can put all the information from the cursor in an array. I try this:
DECLARE
CURSOR firstnames_students IS
select last_name,COLUMN_VALUE as "FIRSTNAME" from persons p, TABLE(p.last_name) p2;
v_lastname VARCHAR(50);
v_firstname VARCHAR(50);
v_I NUMBER := 1;
v_count NUMBER := 0;
v_contor INTEGER := 0;
TYPE MyTab IS TABLE OF persons%ROWTYPE INDEX BY VARCHAR2(20);
std MyTab;
BEGIN
OPEN firstnames_students;
LOOP
FETCH firstnames_students INTO v_lastname, v_firstname;
EXIT WHEN firstnames_students%NOTFOUND;
DBMS_OUTPUT.PUT_LINE(v_lastname || ' ' || v_firstname);
END LOOP;
--select * INTO std FROM firstnames_students;
CLOSE firstnames_students;
END;

Answer 1

SET SERVEROUTPUT ON;
DECLARE
CURSOR students IS
SELECT * FROM persons;
v_row PERSONS%ROWTYPE;
v_names SYS.ODCIVARCHAR2LIST := SYS.ODCIVARCHAR2LIST();
v_count INT := 0;
BEGIN
OPEN students;
LOOP
FETCH students INTO v_row;
EXIT WHEN students%NOTFOUND;
v_names.EXTEND;
v_names(v_names.COUNT) := v_row.last_name;
FOR i IN 1 .. v_row.first_name.COUNT LOOP
v_names.EXTEND;
v_names(v_names.COUNT) := v_row.first_name(i);
END LOOP;
END LOOP;
CLOSE students;
FOR i IN 1 .. v_names.COUNT LOOP
IF INSTR( v_names(i), 'n' ) > 0 THEN
v_count := v_count + 1;
DBMS_OUTPUT.PUT_LINE( v_names(i) );
END IF;
END LOOP;
DBMS_OUTPUT.PUT_LINE( v_count );
END;
Output:
John
Helen
Obrian
Logan
4