複数の行をフェッチして1つの変数に格納-ORACLESTOREDPROCEDURE

CREATE PROCEDURE a_proc
AS
    CURSOR names_cur IS
        SELECT  student_name
        FROM    student.student_details
        WHERE   class_id = 'C';

    names_t  names_cur%ROWTYPE;
    TYPE names_ntt IS TABLE OF names_t%TYPE; -- must use type
    l_names  names_ntt;
BEGIN
    OPEN  names_cur;
    FETCH names_cur BULK COLLECT INTO l_names;
    CLOSE names_cur;

    FOR indx IN 1..l_names.COUNT LOOP
        DBMS_OUTPUT.PUT_LINE(l_names(indx).student_name);
    END LOOP;
END a_proc;