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sqlserver中重復(fù),sqlserver查詢重復(fù)數(shù)據(jù)

如何使用sql語句在sqlserver中刪除重復(fù)數(shù)據(jù)

題主可 參考下列例句:

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刪除表t1字段col1有重復(fù)的記錄

delete from t1 where exists

(select 1 from (select col1 from t1 group by col1 having count(1)1) t where t.col1=t1.col1);

如果希望對(duì)于有重復(fù)的記錄希望保留其中一條記錄而不是全部刪除,則可以運(yùn)行下列語句,前提是數(shù)據(jù)表必須含有自增id列。

delete from t1 where exists

(select 1 from (select col1,max(id) as id from t1 group by col1 having count(1)1) t where t.col1=t1.col1 and t.idt1.id);

SQLserver數(shù)據(jù)庫中所有字段全部一樣的重復(fù)數(shù)據(jù)如何刪除?

找到最大的rowid即可。

Sql代碼:

alter?proc?getNotDupData??

as??

--clear?temp?table??

delete?ODS.dbo.Agent??

delete?from?stage.dbo.tmpDup??

delete?from?stage.dbo.tmpRowNo??

delete?from?stage.dbo.tmpMaxRowNo??

--create?dup?table??

insert?into?stage.dbo.tmpDup??

select?distinct?AgentLogin,AgentSurName,AgentGivenName???from?stage.dbo.dAgentPerformanceStat??

where?AgentSurname?is?not?null?and?agentlogin?like?'3%'??order?by?AgentLogin??

--add?rowNo??

insert?into?tmpRowNo??

select?*,ROW_NUMBER()over(order?by?AgentLogin)?as?rowno??from?tmpDup???

--get?max?rowno??

insert?into??stage.dbo.tmpMaxRowNo??

select?max(rowno)?as?'rowno'???from?stage.dbo.tmpRowNo??group?by?AgentLogin?having?count(*)1??

--remove?max?rowno??

delete?from?stage.dbo.tmpRowNo?where??rowno?in?(select?*?from?stage.dbo.tmpMaxRowNo)??

--insert?into?ods??

insert?into?ODS.dbo.Agent?select?AgentLogin,AgentSurName,AgentGivenName?from?stage.dbo.tmpRowNo

sqlserver怎么去掉重復(fù)的數(shù)據(jù)

select distinct * into #tmp from s2

drop table s2

select * into s2 from #tmp

drop table #tmp

利用臨時(shí)表刪除重復(fù)數(shù)據(jù)

本文名稱:sqlserver中重復(fù),sqlserver查詢重復(fù)數(shù)據(jù)
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