① sqlserver 去掉重复记录
首先设定表tb_a 唯一关键字段 xh,以及要查询的重复字段 mc 则查询mc重复的sqlserver语句如下
select mc from tb_a where xh not in (select min(xh) xh from tb_a group by mc)
② sql server去重
老生常谈,没有编号的话,你自己使用row_number生成一个编号,然后删除相应的数据
sqlserver使用row_number去重
你可以看一看里面的写法,主要原理,分组生成编号,最后只保留分组中编号为一的一行数据,其余的数据都删除掉。
delete[A2]from
(selectrow_number()over(PartitionBybabyname,[公司名称],[调查结果]
orderbybabyname)askeyId2,*
from[测试])as[A2]
where[A2].keyId2!=1
请试一试,如有疑问,及时沟通!
③ sqlserver怎么删除重复数据
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)
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
④ SqlServer 去重
用excel画个草图呗,原来例子什么样,你想得到的什么样,这样方便回答
⑤ sql语句去重distinct方法是什么
sql语句去重distinct方法是根据name和id两个字段来去重的。这种方式Access和SQLServer同时支持,返回的结果为两行,这说明distinct并非是对xing和ming两列字符串拼接后再去重的,而是分别作用于了xing和ming列。
sql语句去重distinct特点
distinct语句中select显示的字段只能是distinct指定的字段,其他字段是不可能出现的,例如假如表A有备注列,如果想获取distincname,以及对应的备注字段想直接通过distinct是不可能实现的,但可以通过其他方法实现关于SQLServer将一列的多行内容拼接成一行的问题讨论。
distinct这个关键字用来过滤掉多余的重复记录只保留一条,但往往只用它来返回不重复记录的条数,而不是用它来返回不重记录的所有值。其原因是distinct只有用二重循环查询来解决,而这样对于一个数据量非常大的站来说,无疑是会直接影响到效率的。
⑥ sqlserver 怎样将所有的字段去掉重复的数据
找到最大的rowid即可。
Sql代码:
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 p 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
⑦ SQLServer去重复查询,不删除重复数据
1、要有定位基准,也就是说,你的表必需要有一个不重复的键值,如果没有,请你给这个表加一个字段,将这个字段设为自增变量字段,建议为int类型,比如字段名可为“编码”。
2、查重复的数据:
select*from表名where编码in
(select编码from表名groupby编码havingcount(1)>=2)
3、删除所有有重复的记录:
deletefrom表名where
编码in(select编码from表名groupby编码havingcount(1)>=2)
4、删去重复的,只留下重复记录中编码最大的一条:
deletefrom表名where
编码in(select编码from表名groupby编码havingcount(1)>=2)
and编码notin(selectmax(编码)from表名groupby编码havingcount(1)>=2)