union
–n2中存在但在n1中不存的在10728,10730
select * from n1 where OrderID not in (select OrderID from n2)
union
–n1中存在但在n2中不存的在11000,11001
select * from n2 where OrderID not in (select OrderID from n1)
* 四种方法取表里n到m条纪录：
1.
select top m * into 临时表(或表变量) from tablename order by columnname — 将top m笔插入
set rowcount n
select * from 表变量 order by columnname desc
2.
select top n * from (select top m * from tablename order by columnname) a order by columnname desc
3.如果tablename里没有其他identity列，那么：
select identity(int) id0,* into #temp from tablename
取n到m条的语句为：
select * from #temp where id0 >=n and id0 <= m
如果你在执行select identity(int) id0,* into #temp from tablename这条语句的时候报错,那是因为你的DB中间的select into/bulkcopy属性没有打开要先执行：
exec sp_dboption 你的DB名字,’select into/bulkcopy’,true
4.如果表里有identity属性，那么简单：
select * from tablename where identitycol between n and m
* 如何删除一个表中重复的记录？
create table a_dist(id int,name varchar(20))
insert into a_dist values(1,’abc’)
insert into a_dist values(1,’abc’)
insert into a_dist values(1,’abc’)
insert into a_dist values(1,’abc’)
exec up_distinct ‘a_dist’,’id’
