--索引為31-40的資料
select top 10 * from orderitems where id not in (select top 30 id from orderitems)
--複製資料
insert into distinctselect(username,state,ordertime) select username,state,ordertime from orderitems
--去除所有重複的記錄(完全重複)
select distinct username ,id, state,ordertime into #table1 from [distinctselect]
delete from [distinctselect]
insert into [distinctselect](username,state,ordertime) select username,state,ordertime from #table1
drop table #table1
--刪除某列重複的記錄
delete t
from [distinctselect] t
where exists (
select 1 from [distinctselect] where username=t.username and idselect * from [distinctselect] order by username
delete from [distinctselect]
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