abap loop at first last new end
loop 循环里面用可用at进行分组汇总，at first 用于第一行；
at last 用于最后一行；
at new field 当field字段前面或者他本身的值与上一条记录的值不同时，才执行at endat里面的代码；
at end field 与at new相似，这里只是与下一条记录的值进行比较。
实例代码：
DATA: t1(4) TYPE c, t2 TYPE i.
FIELD-GROUPS: header.
INSERT t2 t1 INTO header.
t1 ='AABB'. t2 = 1. EXTRACT header.
t1 ='BBCC'. t2 = 2. EXTRACT header.
t1 ='AAAA'. t2 = 2. EXTRACT header.
t1 ='AABB'. t2 = 1. EXTRACT header.
t1 ='BBBB'. t2 = 2. EXTRACT header.
t1 ='BBCC'. t2 = 2. EXTRACT header.
t1 ='AAAA'. t2 = 1. EXTRACT header.
t1 ='BBBB'. t2 = 1. EXTRACT header.
t1 ='AAAA'. t2 = 3. EXTRACT header.
t1 ='AABB'. t2 = 1. EXTRACT header.
SORT BY t1 t2.
LOOP.
AT FIRST.
WRITE 'Start of LOOP'.
ULINE.
ENDAT.
AT NEW t1.
WRITE / ' New T1:'.
ENDAT.
AT NEW t2.
WRITE / ' New T2:'.
ENDAT.
WRITE: /14 t1, t2.
AT END OF t2.
WRITE / 'End of T2'.
ENDAT.
AT END OF t1.
WRITE / 'End of T1'.
ENDAT.
AT LAST.
ULINE.
ENDAT.
ENDLOOP.
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