SQL重复记录查询

1、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断 

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

例二: 

select * from testtable 
where numeber in (select number from people group by number having count(number) > 1 ) 

可以查出testtable表中number相同的记录  

2、删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录 

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) 

3、查找表中多余的重复记录(多个字段)  

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

4、删除表中多余的重复记录(多个字段),只留有rowid最小的记录 

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) 

5、查找表中多余的重复记录(多个字段),不包含rowid最小的记录 

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) 

(二) 

比方说 

在A表中存在一个字段“name”, 

而且不同记录之间的“name”值有可能会相同, 

现在就是需要查询出在该表中的各记录之间,“name”值存在重复的项; 

Select Name,Count(*) From A Group By Name Having Count(*) > 1 

如果还查性别也相同大则如下: 

Select Name,sex,Count(*) From A Group By Name,sex Having Count(*) > 1 

(三) 

方法一 

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 
 
fetch cur_rows into @id,@max 
 
end 
 
close cur_rows 
 
set rowcount 0 

方法二  

有两个意义上的重复记录,一是完全重复的记录,也即所有字段均重复的记录,二是部分关键字段重复的记录,比如Name字段重复,而其他字段不一定重复或都重复可以忽略。  

1、对于第一种重复,比较容易解决,使用 

select distinct * from tableName 

就可以得到无重复记录的结果集。  

如果该表需要删除重复的记录(重复记录保留1条),可以按以下方法删除 

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

发生这种重复的原因是表设计不周产生的,增加唯一索引列即可解决。  

2、这类重复问题通常要求保留重复记录中的第一条记录,操作方法如下  

假设有重复的字段为Name,Address,要求得到这两个字段唯一的结果集 

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) 

最后一个select即得到了Name,Address不重复的结果集(但多了一个autoID字段,实际写时可以写在select子句中省去此列)  

(四)  

查询重复 

select * from tablename where id in ( 
 
select id from tablename  
 
group by id  
 
having count(id) > 1 
 
) 

以上就是小编为大家带来的SQL重复记录查询 查询多个字段、多表查询、删除重复记录的方法的全部内容了,希望对大家有所帮助,多多支持~

标签:
sql删除字段重复记录

免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
白云城资源网 Copyright www.dyhadc.com

稳了!魔兽国服回归的3条重磅消息!官宣时间再确认!

昨天有一位朋友在大神群里分享,自己亚服账号被封号之后居然弹出了国服的封号信息对话框。

这里面让他访问的是一个国服的战网网址,com.cn和后面的zh都非常明白地表明这就是国服战网。

而他在复制这个网址并且进行登录之后,确实是网易的网址,也就是我们熟悉的停服之后国服发布的暴雪游戏产品运营到期开放退款的说明。这是一件比较奇怪的事情,因为以前都没有出现这样的情况,现在突然提示跳转到国服战网的网址,是不是说明了简体中文客户端已经开始进行更新了呢?