--Change为自定义较上期的变化值

select NoteID,code,UpdateTime,Balance

,Change=Balance-

(

--根据主查询t1得出的代码和时间作为条件获得小于最大日期的上期max(UpdateTime)日期的额度Balance值

select Balance from SMS_FillMonenyNote where code=t1.code and 

UpdateTime=(select max(UpdateTime) from SMS_FillMonenyNote 

where code=t1.code and UpdateTime<t1.UpdateTime)

) 

from SMS_FillMonenyNote as t1 

--根据not exists找出不存在有大于NoteID的t1.NoteID，也就是最大的NoteID

where not exists (select * from SMS_FillMonenyNote where code=t1.code

and NoteID>t1.NoteID)

order by code