LOOP AT GROUP语法练习

DATA:P_MENGE TYPE EKKO-WKURS.
DATA:P_MENGE1 TYPE EKKO-WKURS.
SELECT  *
 FROM EKKO
 INTO TABLE @DATA(LT_EKKO)
 UP TO 5 ROWS.
SORT LT_EKKO BY LIFNR ERNAM.
LOOP AT LT_EKKO INTO DATA(LS_EKKO)
  GROUP BY ( LIFNR = LS_EKKO-LIFNR ERNAM = LS_EKKO-ERNAM )."按括号里的条件进行分组
  LOOP AT GROUP LS_EKKO INTO DATA(MEMBER)."按分组后进行组员的访问
    P_MENGE = P_MENGE + MEMBER-WKURS."这里就是对同一组的进行某个字段的汇总
  ENDLOOP.
  WRITE:/  P_MENGE.
  CLEAR P_MENGE.
ENDLOOP.
LOOP AT LT_EKKO INTO DATA(LS_EKKO1)
  GROUP BY ( LIFNR = LS_EKKO1-LIFNR ERNAM = LS_EKKO1-ERNAM ) INTO DATA(KEY2).
*  LOOP AT GROUP LS_EKKO1 INTO DATA(MEMBER1). "后面的工作区会将分类的两个字段加入进去，前面的工作区是没有值的
*  ENDLOOP.
  LOOP AT GROUP KEY2 INTO DATA(MEMBER2)."这里要用后面的工作区进行组员的访问
    P_MENGE1 = P_MENGE1 + MEMBER-WKURS."这里就是对同一组的进行某个字段的汇总
  ENDLOOP.
  WRITE:/ P_MENGE1.
  CLEAR P_MENGE1.
ENDLOOP.