(1) 通过索引插入行： INSERT LINE INTO ITAB INDEX IDX.
(2)一般性的插入单行：INSERT [LINE INTO | INITIAL LINE INTO ] TABLE ITAB.
语句中增加了TABLE关键字，对于不同类型的内表，其意义和用法是有区别的：
1.对于标准表而言，和APPEND LINE TO ITAB。的结果一样。
2.对于排序表而言，插入行不可以打乱关键字的排序顺序，否则报错。
3.对于哈希表而言，插入过程中系统按照关键字对行进行定位。
例如：
REPORT demo_int_tables_insert .
DATA: BEGIN OF line,
land(3) TYPE c,
name(10) TYPE c,
age TYPE i,
weight TYPE p DECIMALS 2,
END OF line.
DATA itab LIKE SORTED TABLE OF line “替换成
STANDARD 和HASHED ，看看有什么不同。
WITH NON-UNIQUE KEY land name age weight.
line-land = 'G'. line-name = 'Hans'.
line-age = 20. line-weight = '80.00'.
INSERT line INTO TABLE itab.
line-land = 'USA'. line-name = 'Nancy'.
line-age = 35. line-weight = '45.00'.
INSERT line INTO TABLE itab.
line-land = 'USA'. line-name = 'Howard'.
line-age = 40. line-weight = '95.00'.
INSERT line INTO TABLE itab.
line-land = 'GB'. line-name = 'Jenny'.
line-age = 18. line-weight = '50.00'.
INSERT line INTO TABLE itab.
line-land = 'F'. line-name = 'Michele'.
line-age = 30. line-weight = '60.00'.
INSERT line INTO TABLE itab.
line-land = 'G'. line-name = 'Karl'.
line-age = 60. line-weight = '75.00'.
INSERT line INTO TABLE itab.
LOOP AT itab INTO line.
WRITE: / line-land, line-name, line-age, line-weight.
ENDLOOP.