ABAP : select data into internaltable

tables : ZPAT_STUDENT.
DATA it_student TYPE ZPAT_STUDENT OCCURS 0 WITH HEADER LINE.

select * from ZPAT_STUDENT into it_student.
  append it_student.
ENDSELECT.

select * from ZPAT_STUDENT into it_student. " the internal table can not contain anything
ENDSELECT.

select * from ZPAT_STUDENT into TABLE it_student.

WRITE : it_student-name.