PL/SQL中的包体问题

SQL code

create or replace
PACKAGE BODY set_pass_rate_pkg AS
  ln_total_cnt NUMBER DEFAULT 0;
  ln_pass_cnt NUMBER DEFAULT 0;
  ln_pass_rate NUMBER DEFAULT 0;
  ln_adjust_cnt NUMBER DEFAULT 0;
  lv_messager VARCHAR2(2000);
  type adjust_ttype IS TABLE OF rowid INDEX BY pls_integer;
  it_adjust adjust_ttype;
  
  
PROCEDURE main(p_pass_rate IN NUMBER
   ,p_class_id IN NUMBER
   ,p_course_name IN VARCHAR2
) AS 
  it_student  wl_score_tab.student_id%TYPE;
  it_course   wl_score_tab.COURSE_ID%TYPE;
  CURSOR get_adjust_cur(p_adjust_cnt in number) IS
  SELECT
    tt.rowid AS row_id
  From(  
  SELECT
    wst.ROWID AS row_id,
    ws.CLASS_ID AS class_id,
    ws.STUDENT_ID AS student_id,
    ws.STUDENT_NAME AS student_name,
    wct.COURSE_ID AS course_id,
    wct.COURSE_NAME AS course_name,
    wst.SCORE AS score,
  CASE
  WHEN wst.score -60 < 0 THEN
    rank() over(PARTITION BY
    CASE
    WHEN wst.score -60 >= 0 THEN NULL
    ELSE 'A'
    END
    ORDER BY wst.score)
  END adjust_flag
  FROM wl_student_tab ws,
    wl_score_tab wst,
    wl_course_tab wct
  WHERE ws.class_id = p_class_id
   AND wst.course_id =
    (SELECT wct.course_id
     FROM wl_course_tab wct
     WHERE wct.course_name = p_course_name))tt 
  where tt.adjust_flag <= p_adjust_cnt;

  BEGIN
    SELECT COUNT(*)
    INTO ln_total_cnt
    FROM wl_score_tab wst,
      wl_student_tab ws
    WHERE ws.class_id = p_class_id
     AND wst.course_id =
      (SELECT course_id
       FROM wl_course_tab
       WHERE course_name = p_course_name)
    ;

    SELECT COUNT(*)
    INTO ln_pass_cnt
    FROM wl_score_tab wst,
      wl_student_tab ws
    WHERE ws.class_id = p_class_id
     AND wst.course_id =
      (SELECT course_id
       FROM wl_course_tab
       WHERE course_name = p_course_name)
    AND wst.score -60 > 0;

    IF(ln_total_cnt = 0) THEN
      DBMS_OUTPUT.PUT_LINE('Data need not adjust!');
    END IF;

    ln_pass_rate := ROUND(ln_pass_cnt / ln_total_cnt *100,   2);

    IF(ln_pass_rate -p_pass_rate > 0) THEN
      DBMS_OUTPUT.PUT_LINE('date need not adjust!!');
    ELSE
      ln_adjust_cnt := ceil((p_pass_rate -ln_pass_rate) *ln_total_cnt / 100);

      OPEN get_adjust_cur(ln_adjust_cnt);
      FETCH get_adjust_cur bulk collect
      INTO it_adjust;
      CLOSE get_adjust_cur;

      forall i IN 1 .. it_adjust.COUNT
      UPDATE wl_score_tab wst
      SET wst.score = 60
      WHERE wst.rowid = it_adjust(i) returning wst.student_id,
        wst.course_id bulk collect
      INTO it_student,it_course;
        
      FOR i IN it_student.FIRST .. it_student.LAST
      LOOP
        IF(i = it_student.FIRST) THEN
          DBMS_OUTPUT.PUT_LINE('updated record list');
        END IF;
        DBMS_OUTPUT.PUT_LINE('student_id:' || to_char(it_student(i)) || 'course_id:' || to_char(it_course(i)));
      END LOOP;
      COMMIT;
    END IF;
    NULL;
  END main;

END set_pass_rate_pkg;

forall i IN 1 .. it_adjust.COUNT
  UPDATE wl_score_tab wst
  SET wst.score = 60
  WHERE wst.rowid = it_adjust(i) returning wst.student_id,
  wst.course_id bulk collect
  INTO it_student,it_course;

这块报错
无法混合INTO 列表中的 单行和多行

求助啊

it_student wl_score_tab.student_id%TYPE;
  it_course wl_score_tab.COURSE_ID%TYPE;
这个是普通类型你要当数组用么？

改成下面这样的。
  it_student_type is table of wl_score_tab.student_id%TYPE index by binary_intger;
  it_course_type is table if wl_score_tab.COURSE_ID%TYPE index by binary_intger;
  it_student it_student_type;
  it_course it_course_type;