SQL "*" for Inner join

code1.abap

DATA: wa_anek TYPE anek,
      tb_anek TYPE TABLE OF anek,
      wa_anep TYPE anep,
      tb_anep TYPE TABLE OF anep,
      tb_anep_fields TYPE TABLE OF string,
      tb_anek_fields TYPE TABLE OF string.

INITIALIZATION.

 DATA: l_string TYPE string.
  IF tb_anek_fields[] IS INITIAL.
    DATA: tb_dfies TYPE TABLE OF dfies,
          wa_dfies TYPE dfies.
    CALL FUNCTION 'DDIF_FIELDINFO_GET'
      EXPORTING
        tabname        = 'ANEK'
      TABLES
        dfies_tab      = tb_dfies
      EXCEPTIONS
        not_found      = 1
        internal_error = 2
        OTHERS         = 3.

    LOOP AT tb_dfies INTO wa_dfies.
      CONCATENATE 'K~' wa_dfies-fieldname INTO l_string.
      APPEND l_string TO tb_anek_fields.
    ENDLOOP.
  ENDIF.
  IF tb_anep_fields[] IS INITIAL.
    CALL FUNCTION 'DDIF_FIELDINFO_GET'
      EXPORTING
        tabname        = 'ANEP'
      TABLES
        dfies_tab      = tb_dfies
      EXCEPTIONS
        not_found      = 1
        internal_error = 2
        OTHERS         = 3.

    LOOP AT tb_dfies INTO wa_dfies.
      CONCATENATE 'P~' wa_dfies-fieldname INTO l_string.
      APPEND l_string TO tb_anep_fields.
    ENDLOOP.
  ENDIF.

START-OF-SELECTION.
 CHECK tb_anek_fields[] IS NOT INITIAL.
  SELECT  (tb_anek_fields) FROM ( anek AS k
    INNER JOIN anla AS a ON a~mandt = k~mandt
      AND a~bukrs = k~bukrs AND a~anln1 = k~anln1 AND a~anln2 = k~anln2
    INNER JOIN anep AS p ON k~mandt = p~mandt
      AND k~bukrs = p~bukrs AND k~anln1 = p~anln1 AND k~anln2 = p~anln2
      AND k~gjahr = p~gjahr AND k~lnran = p~lnran )
    INTO TABLE tb_anek
      WHERE a~mandt = sy-mandt AND a~anln1 IN s_anln1
        AND k~budat IN s_budat AND a~anlkl IN r_anlkl AND p~afabe = '01'.
  CHECK tb_anep_fields[] IS NOT INITIAL.
  SELECT  (tb_anep_fields) FROM ( anek AS k
    INNER JOIN anla AS a ON a~mandt = k~mandt
      AND a~bukrs = k~bukrs AND a~anln1 = k~anln1 AND a~anln2 = k~anln2
    INNER JOIN anep AS p ON k~mandt = p~mandt
      AND k~bukrs = p~bukrs AND k~anln1 = p~anln1 AND k~anln2 = p~anln2
      AND k~gjahr = p~gjahr AND k~lnran = p~lnran )
    INTO TABLE tb_anep
    WHERE a~mandt = sy-mandt AND k~budat IN s_budat AND a~anlkl IN r_anlkl
      AND p~afabe = '01' AND p~zujhr = '0000' AND p~zucod = '0000'
      AND a~anln1 IN s_anln1.