從字面看好像作用是相同的储玫，但具體使用以來還是有區(qū)別的。如果都是從數(shù)據(jù)庫表中select一次數(shù)據(jù)驯镊，添加到內(nèi)表中葫督，他們的作用相同；但是多次板惑，他們的作用則有很大差別橄镜，INTO TABLE：將數(shù)據(jù)select出來添加到內(nèi)表時會將內(nèi)表先清空再添加，而APPENDING TABLE則會直接追加冯乘，實現(xiàn)累計效果洽胶。
解釋事例：

DATA:BEGIN OF lt_matnr OCCURS 0,
      matnr TYPE mara-matnr,
     END OF lt_matnr.
WRITE :/ '兩次INTO TABLE,內(nèi)表數(shù)據(jù)：'.
SELECT matnr UP TO 1 ROWS INTO TABLE lt_matnr FROM mara.
SELECT matnr UP TO 1 ROWS INTO TABLE lt_matnr FROM mara.
LOOP AT lt_matnr.
  WRITE:/ lt_matnr-matnr.
ENDLOOP.
REFRESH :lt_matnr.
WRITE :/ '-----------------------------------------------------------'.
WRITE :/ '兩次APPENDING TABLE,內(nèi)表數(shù)據(jù)：'.
SELECT matnr UP TO 1 ROWS APPENDING TABLE lt_matnr FROM mara.
SELECT matnr UP TO 1 ROWS APPENDING TABLE lt_matnr FROM mara.
LOOP AT lt_matnr.
  WRITE:/ lt_matnr-matnr.
ENDLOOP.

運行結(jié)果

Paste_Image.png

實戰(zhàn)中的用法：
例如我們預(yù)計需新建的表數(shù)據(jù)會達到億級別數(shù)據(jù)，從查詢性能的角度考慮裆馒，我們需要將表按照一定的數(shù)據(jù)維度姊氓，將表拆分成幾個去存儲數(shù)據(jù)丐怯。那么在查詢是就需要將幾張表的數(shù)據(jù)都放到一個內(nèi)表中，由于這種場景中多表的結(jié)構(gòu)基本相同翔横，所以使用APPENDING TABLE將會大大簡化代碼

        SELECT matnr
               lifnr
               werks_d AS werks
               oder_flag
        APPENDING TABLE lt_zpu_matnr
        FROM zpu_matnr_d
        WHERE matnr = ls_mepoitem-matnr
          AND lifnr IN (ls_mepoitem-charg,'')
          AND werks_d = lv_lgort1
          AND datae >= sy-datum
          AND datab <= sy-datum
          AND oder_flag = space
          AND del_flag = space
          AND enable = 'X'.
        SELECT matnr
               lifnr
               werks_d AS werks
               oder_flag
        APPENDING TABLE lt_zpu_matnr
        FROM zpu_matnr_l
        WHERE matnr = ls_mepoitem-matnr
          AND lifnr IN (ls_mepoitem-charg,'')
          AND werks_d = lv_lgort1
          AND datae >= sy-datum
          AND datab <= sy-datum
          AND oder_flag = space
          AND del_flag = space
          AND enable = 'X'.
        SELECT matnr
              lifnr
              werks_s AS werks
              oder_flag
       APPENDING TABLE lt_zpu_matnr
       FROM zpu_matnr_p
       WHERE matnr = ls_mepoitem-matnr
         AND lifnr IN (ls_mepoitem-charg,'')
         AND werks_s = lv_lgort1
         AND datae >= sy-datum
         AND datab <= sy-datum
         AND oder_flag = space
         AND del_flag = space
         AND enable = 'X'.
        SELECT matnr
               lifnr
               werks_s AS werks
               oder_flag
        APPENDING TABLE lt_zpu_matnr
        FROM zpu_matnr_s
        WHERE matnr = ls_mepoitem-matnr
          AND lifnr IN (ls_mepoitem-charg,'')
          AND werks_s = lv_lgort1
          AND datae >= sy-datum
          AND datab <= sy-datum
          AND oder_flag = space
          AND del_flag = space
          AND enable = 'X'.

http://bbs.sapclub.cc/thread-301-1-1.html
(出處: SAP顧問圈)