差异：Collect会根据Key字段对I P F类型的数据进行汇总，Append只是向内表最后一行加入一条记录

演示代码：

DATA: GT_SFLIGHT TYPE TABLE OF SFLIGHT WITH HEADER LINE.

*COLLECT 只汇总 I P F类型字段，其他类型字段为KEY Field GT_SFLIGHT-CARRID = ‘AB’. GT_SFLIGHT-CONNID = ‘0014’. GT_SFLIGHT-PRICE = ‘120.98’. COLLECT GT_SFLIGHT.

GT_SFLIGHT-CARRID = ‘AB’. GT_SFLIGHT-CONNID = ‘0014’. GT_SFLIGHT-PRICE = ‘159.77’. COLLECT GT_SFLIGHT.

CL_DEMO_OUTPUT=>DISPLAY( GT_SFLIGHT[] ).

*APPEND CLEAR: GT_SFLIGHT,GT_SFLIGHT[].

GT_SFLIGHT-CARRID = ‘AB’. GT_SFLIGHT-CONNID = ‘0014’. GT_SFLIGHT-PRICE = ‘120.98’. APPEND GT_SFLIGHT.

GT_SFLIGHT-CARRID = ‘AB’. GT_SFLIGHT-CONNID = ‘0014’. GT_SFLIGHT-PRICE = ‘159.77’. APPEND GT_SFLIGHT.

CL_DEMO_OUTPUT=>DISPLAY( GT_SFLIGHT[] ).

输出效果：