LOOP AT GROUP语法熟悉

SELECT  *
  FROM EKKO
  INTO TABLE @DATA(LT_EKKO)
  UP TO 100 ROWS.

SORT LT_EKKO BY LIFNR ERNAM.

LOOP AT LT_EKKO INTO DATA(LS_EKKO) GROUP BY LS_EKKO-LIFNR.
"多个分组条件
"LOOP AT LT_EKKO INTO DATA(LS_EKKO) GROUP BY ( LIFNR = LS_EKKO-LIFNR ERNAM = LS_EKKO-ERNAM ).
  LOOP AT GROUP LS_EKKO INTO DATA(MEMBER).

  ENDLOOP.

ENDLOOP.

　　按LIFNR分组,LS_EKKO为每一组的第一行
LOOP AT LT_EKKO INTO DATA(LS_EKKO) GROUP BY LS_EKKO-LIFNR.
LOOP AT GROUP访问组成员
LOOP AT GROUP LS_EKKO INTO DATA(MEMBER).

SELECT  *
    FROM EKKO
    INTO TABLE @DATA(LT_EKKO)
   UP TO  ROWS.

SORT LT_EKKO BY LIFNR ERNAM.

LOOP AT LT_EKKO INTO DATA(LS_EKKO) GROUP BY ( KEY1 = LS_EKKO-LIFNR KEY2 = LS_EKKO-ERNAM ) INTO DATA(KEY).

  LOOP AT GROUP KEY INTO DATA(MEMBER).

  ENDLOOP.

ENDLOOP.

按LIFNR，ERNAM分组,LS_EKKO为空

LOOP AT LT_EKKO INTO DATA(LS_EKKO) GROUP BY ( KEY1 = LS_EKKO-LIFNR KEY2 = LS_EKKO-ERNAM ) INTO DATA(KEY).

LOOP AT GROUP按组的分组条件访问组成员，其中KEY可以理解为工作区，包含lifnr和ername. member里面包含有KEY工作区关键字段.
LOOP AT GROUP KEY INTO DATA(MEMBER).

本文转载自：https://www.jianshu.com/p/f34f59ba2c17