MySQL – Eine vollständige Liste von Methoden zum Abfragen doppelter Datensätze und zum Löschen doppelter Datensätze

SELECT * FROM t_info a WHERE ((SELECT COUNT(*) FROM t_info WHERE Title = a.Title) > 1) ORDER BY Title DESC

Select * From 表 Where 重复字段 In (Select 重复字段 From 表 Group By 重复字段 Having Count(*)>1)

Select * From HZT Where ID In (Select Max(ID) From HZT Group By Title)

Delete 表 Where 重复字段 In (Select 重复字段 From 表 Group By 重复字段 Having Count(*)>1)

Delete HZT Where ID Not In (Select Max(ID) From HZT Group By Title)

select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)

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)

select * from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)

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)

select * 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)

select distinct * from tableName

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)