REPORT demo_select_inner_join.

DATA: BEGIN OF wa,
        carrid TYPE spfli-carrid,
        connid TYPE spfli-connid,
        fldate TYPE sflight-fldate,
        bookid TYPE sbook-bookid,
      END OF wa,
      itab LIKE SORTED TABLE OF wa
                WITH UNIQUE KEY carrid connid fldate bookid.

SELECT  p~carrid p~connid f~fldate b~bookid
  INTO  CORRESPONDING FIELDS OF TABLE itab
  FROM  ( ( spfli AS p
            INNER JOIN sflight AS f ON p~carrid = f~carrid AND
                                       p~connid = f~connid    )
            INNER JOIN sbook   AS b ON b~carrid = f~carrid AND
                                       b~connid = f~connid AND
                                       b~fldate = f~fldate     )
  WHERE p~cityfrom = 'FRANKFURT' AND
        p~cityto   = 'NEW YORK'  AND
        f~seatsmax > f~seatsocc.

LOOP AT itab INTO wa.
  AT NEW fldate.
    WRITE: / wa-carrid, wa-connid, wa-fldate.
  ENDAT.
  WRITE / wa-bookid.
ENDLOOP.