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河南网站优化建设,上海市人大常委会,web软件设计,专门做酒店设计的网站1.3.19 关键字GROUP BY用法 LOOP GROUP BY 分组循环的使用方法 1.格式： LOOP AT 内表 INTO DATA(工作区) GROUP BY ( 字段工作区-字段 size GROUP SIZE "分组组数-- index GROUP INDEX ) "分组的组序号 ASCENDING ASSIGNING FIELD-SYMBOL(&l…

1.3.19 关键字GROUP BY用法

LOOP GROUP BY 分组循环的使用方法

1.格式：

LOOP AT 内表 INTO DATA(工作区) GROUP BY ( 字段 = 工作区-字段

size = GROUP SIZE "分组组数--

index = GROUP INDEX ) "分组的组序号

ASCENDING ASSIGNING FIELD-SYMBOL(<组>).

LOOP AT GROUP <组> ASSIGNING FIELD-SYMBOL(<指针>).

"对指针进行操作，和普通的loop循环相似

ENDLOOP

2.简而言之：就是第一个loop循环是把内表进行分组，第二loop循环是把组里的数据循环读出来进行修改判断等操作。

3.可以替代AT END OF /AT NEW OF。

4. 具体实例

TYPES: BEGIN OF ty_employee,
         name TYPE char30,
         role TYPE char30,
         age  TYPE i,
         sex  TYPE char10,
       END OF ty_employee,
       ty_employee_t TYPE STANDARD TABLE OF ty_employee WITH KEY name.

"对内表进行赋值"
DATA(gt_employee) = VALUE ty_employee_t(
( name = 'John'     role = 'ABAP'       age = 34  sex =  'MAN'   )
( name = 'Alice'     role = 'FI Consultant'   age = 42  sex =  'WOMAN'  )
( name = 'Barry'    role = 'ABAP'       age = 54   sex =  'WOMAN'  )
( name = 'Mary'     role = 'FI Consultant'   age = 37  sex =  'WOMAN' )
( name = 'Arthur'   role = 'ABAP'       age = 34  sex =  'MAN'  )
( name = 'Mandy'   role = 'SD Consultant'     age = 64  sex =  'MAN'  ) ).

DATA: gv_tot_age TYPE i,
      gv_avg_age TYPE decfloat34.
"通过角色进行分组"
LOOP AT gt_employee INTO DATA(ls_employee) GROUP BY ( role  = ls_employee-role
                                           size  = GROUP SIZE  "分组组数"
                                           index = GROUP INDEX ) "分组的组序号"
  ASCENDING    ASSIGNING FIELD-SYMBOL(<group>).

  CLEAR: gv_tot_age.
  WRITE: / | 组序号: { <group>-index }    角色: { <group>-role WIDTH = 15 }|
              & |     这个组有几条数据: { <group>-size  } |.

  "loop循环组，将组里的数据读出来"
  LOOP AT GROUP <group> ASSIGNING FIELD-SYMBOL(<ls_member>).
    gv_tot_age = gv_tot_age + <ls_member>-age.
    WRITE: /13 <ls_member>-name .
  ENDLOOP.

  gv_avg_age = gv_tot_age / <group>-size.
  WRITE: / |组平均年龄: { gv_avg_age }|.
  SKIP.
ENDLOOP.

执行效果：

具体实例2：

“按照楼栋编码+产品类型+经营属性汇总

    READ TABLE lt_zspl0016_1 TRANSPORTING NO FIELDS WITH KEY posid = ls_itab_ld-posid BINARY SEARCH.
    IF sy-subrc IS INITIAL.
      LOOP AT lt_zspl0016_1 INTO DATA(ls_zspl0016_1) FROM sy-tabix WHERE posid = ls_itab_ld-posid
GROUP BY ( posid = ls_zspl0016_1-posid
           cp_num = ls_zspl0016_1-cp_num
           jysx_id = ls_zspl0016_1-jysx_id ).

实例3：

" 权限组织和员工子组数据整合
  CLEAR: lt_auth_aa.
  LOOP AT lt_auth_a INTO ls_auth_s GROUP BY ( otype = ls_auth_s-otype
                                              objid = ls_auth_s-objid
                                              index = GROUP INDEX
                                               size = GROUP SIZE
                                             ) INTO DATA(lt_grp_auth_z).
    CLEAR: ls_auth_aa,lt_auth_s_zz.
    ls_auth_aa-otype = lt_grp_auth_z-otype.
    ls_auth_aa-objid = lt_grp_auth_z-objid.

    LOOP AT GROUP lt_grp_auth_z INTO DATA(ls_grp_auth_z).
      DELETE ls_grp_auth_z-auth_s WHERE rtype IS INITIAL.
      IF ls_grp_auth_z-auth_s IS INITIAL.
        CLEAR lt_auth_s_zz.
        EXIT.
      ENDIF.
      LOOP AT ls_grp_auth_z-auth_s INTO DATA(ls_auth_ss).
        COLLECT ls_auth_ss INTO lt_auth_s_zz.
      ENDLOOP.
    ENDLOOP.
    ls_auth_aa-auth_s = lt_auth_s_zz.
    APPEND ls_auth_aa TO lt_auth_aa.
  ENDLOOP.