1个内表里有3个字段，字段1、2是主键，汇总放到字段3：
代码语言：javascript复制REPORT zmatinal.
TYPES:
BEGIN OF struct,
key1 TYPE string,
key2 TYPE string,
col TYPE i,
END OF struct,
itab TYPE STANDARD TABLE OF struct WITH EMPTY KEY.
DATA(itab) = VALUE itab(
( key1 = `a` key2 = `a` col = 1 )
( key1 = `a` key2 = `b` col = 2 )
( key1 = `a` key2 = `a` col = 3 )
( key1 = `a` key2 = `a` col = 4 )
( key1 = `a` key2 = `b` col = 5 )
( key1 = `b` key2 = `a` col = 6 )
( key1 = `b` key2 = `a` col = 7 ) ).
DATA gt_co TYPE TABLE OF struct.
DATA gs_co TYPE struct.
LOOP AT itab INTO DATA(wa_itab) GROUP BY ( key1 = wa_itab-KEY1 key2 = wa_itab-KEY2 ). "这里去重
gs_co-key1 = wa_itab-key1.
gs_co-key2 = wa_itab-key2.
LOOP AT GROUP wa_itab INTO DATA(tmp).
gs_co-col = gs_co-col tmp-col.
ENDLOOP.
APPEND gs_co TO gt_co.
ENDLOOP.
cl_demo_output=>write( gt_co ).
cl_demo_output=>display( ).
