1.Oracle刪除重復記錄.

刪除表中多余的重復記錄，重復記錄是根據單個字段(peopleId)來判斷，只留有rowid最小的記錄.

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)

刪除表中多余的重復記錄(多個字段)，只留有rowid最小的記錄

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)

================================

此方法可以適用于sql ,oracle

declare @max integer,@id integer

declare cur_rows cursor local for select 主字段,count(*) from 表名 group by 主字段 having 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 表名 where 主字段 = @id

/*

DECLARE @count INT

SELECT @count = COUNT(*) from [table1] WHERE [column1] = 1

DELETE TOP (@count-1) from [table1] WHERE [column1] = 1? 這個top后面一定要有括號

*/

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

本文來自CSDN博客，出處：http://b

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