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1.Oracleɾ³ýÖظ´¼Ç¼.
ɾ³ý±íÖжàÓàµÄÖظ´¼Ç¼£¬Öظ´¼Ç¼ÊǸù¾Ýµ¥¸ö×ֶΣ¨peopleId£©À´Åжϣ¬Ö»ÁôÓÐrowid×îСµÄ¼Ç¼.
delete from people
where peopleId  in (select  peopleId  from people  group  by  peopleId   having  count(peopleId) > 1)
and rowid not in (select min(rowid) from  people  group by peopleId  having count(peopleId )>1)
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delete from vitae a
where (a.peopleId,a.seq) in  (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)
================================
´Ë·½·¨¿ÉÒÔÊÊÓÃÓÚsql ,oracle
declare @max integer,@id integer
declare cur_rows cursor local for select Ö÷×Ö¶Î,count(*) from ±íÃû group by Ö÷×ֶΠhaving count(*) >£» 1
open cur_rows
fetch cur_rows into @id,@max
while @@fetch_status=0
begin
select @max = @max -1
set rowcount @max
delete from ±íÃû where Ö÷×ֶΠ= @id
/*
DECLARE @count INT
SELECT @count = COUNT(*) from [table1] WHERE [column1] = 1
DELETE TOP (@count-1) from [table1] WHERE [column1] = 1  Õâ¸ötopºóÃæÒ»¶¨ÒªÓÐÀ¨ºÅ
*/
fetch cur_rows into @id,@max
end
close cur_rows
set rowcount 0
 =======================================
select distinct * into #Tmp from tableName
drop table tableName
select * into tableName from #Tmp
drop table #Tmp
select identity(int,1,1) as autoID, * into #Tmp from tableName
select min(autoID) as autoID into #Tmp2 from #Tmp group by Name,autoID
select * from #Tmp where autoID in(select autoID from #tmp2)
=======================================
 select identity(int,1,1) as id ,name,state into #tempTable from a
delete from a
delete from #tempTable
where id not in
(
 select min(id) from #tempTable group by name
)
insert into a( name,state)
select name,state from #tempTable
drop table #tempTable
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