ABAP : innerjoin with HIDE(find subject)

TABLES: ZPAT_SUBJECT,ZPAT_STUDENT.
TOP-OF-PAGE.
WRITE: / 'NAME', 20 'SCORE', 40 'SUBJECT'.
START-OF-SELECTION.
SELECT * FROM ZPAT_student.
  WRITE: / ZPAT_STUDENT-NAME,
         20 ZPAT_STUDENT-SCORE.
  HIDE : ZPAT_STUDENT-NAME, ZPAT_STUDENT-SCORE,zpat_student-grade.
  ENDSELECT.
AT LINE-SELECTION.
  SELECT * FROM ZPAT_SUBJECT
  WHERE grade  = zpat_student-grade.
    WRITE: / 'NAME', 20 'SCORE', 40 'SUBJECT'.
    WRITE: / zpat_student-NAME,
           20 zpat_student-score,
*           40 zpat_subject-grade.
           40 zpat_subject-subject.
    ENDSELECT.
   CLEAR: zpat_student-NAME,
          zpat_student-score,
          zpat_student-grade,
          zpat_subject-subject.