Mysql必读MySQL中查询、删除重复记录的方法大全

MYSQL应用
select title,count(*) as count from user_table group by title having count>1; 

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

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

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

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

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

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

MYSQL应用
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)

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

MYSQL应用
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)

MYSQL应用
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)

MYSQL应用
select distinct * from tableName

MYSQL应用
select distinct * into #Tmp from tableName
drop table tableName
select * into tableName from #Tmp
drop table #Tmp

MYSQL应用
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)