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sql如何去掉完全重复数据

发布时间: 2022-09-25 03:11:53

‘壹’ sql语句查询 如何删除重复多余的数据

这个是SQL中distinct的典型用法:
1)从字面意思就可以了解到:
distinct
[dis'tiŋkt]
adj.
明显的;独特的;清楚的;有区别的
2)在SQL中用distinct来消除重复出现的字段值。
使得每个字段值只出现一次。
具体用法如下:
select
distinct
字段名
from
表;
distinct
字段名
意思就是只显示一次该字段名
一般情况下和order
by
结合使用,这样可以提高效率。
所以这个问题的答案是:select
distinct
1,2,3,4
from
表;
1,2,3,4分别代表第一,二,三,四列的字段名,我猜测可能第一列就是每个人的ID,
这样你把重复的ID过滤留下一个,估计就是你想要的结果了。
希望我的回答能让您满意。

‘贰’ sql查询去掉重复记录

1、打开要去掉重复数据的数据库,这里新建一张含有重复数据的user表做示例,如下图所示:

‘叁’ 在sql语言中去掉重复值的命令是

distinct。
SQLserver中很明显的去重复的语句是distinct。selectdistinct是去除重复的记录行,count(distinctColumn),消除重复值。还有一些不明显的具有去重功能的词,例如union,会去除重复的记录行或值。

‘肆’ SQL 怎么去除完全重复的数据

用SQL语句,删除掉重复项只保留一条

在几千条记录里,存在着些相同的记录,如何能用SQL语句,删除掉重复的呢
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 peopleName in (select peopleName from people group by peopleName having count(peopleName) > 1)
and peopleId not in (select min(peopleId) from people group by peopleName having count(peopleName)>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)
6.消除一个字段的左边的第一位:
update tableName set [Title]=Right([Title],(len([Title])-1)) where Title like '村%'
7.消除一个字段的右边的第一位:
update tableName set [Title]=left([Title],(len([Title])-1)) where Title like '%村'
8.假删除表中多余的重复记录(多个字段),不包含rowid最小的记录
update vitae set ispass=-1
where peopleId in (select peopleId from vitae group by peopleId

‘伍’ SQL中如何删除重复数据

select
字段1,字段2,字段3
from
table
group
by
字段1,字段2,字段3
having
count(*)>1
用上边这句能找出所有重复的数据
字段1,2,3你替换成你表里的字段名,如果有更多字段的话,你就继续添加,最后group
by的时候不要忘记了
删除的时候要建立一个临时表
create
table
new_table
as
select
字段1,字段2,字段3
from
old_table
group
by
字段1,字段2,字段3;
然后删除原表数据
truncate
table
old_table;
然后把临时表数据反插回去
insert
into
new_table
select
*
from
old_table;

‘陆’ sql如何删除重复数据

sql查询去除重复值语句
sql 单表/多表查询去除重复记录
单表distinct
多表group by
group by 必须放在 order by 和 limit之前,不然会报错
************************************************************************************
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(*)>

‘柒’ sql怎么删除重复数据

你可以先把重复的数据找出来(SELECT columnName,count(1) as 'count' FROM Table group by columnName HAVING count(columnName)>1),作为唯一数据先备份到临时表中,
然后再删除所有重复的数据(DELETE FROM Table where columnName in (SELECT columnName FROM Table group by columnName HAVING count(columnName)>1)),
最后将临时表中备份的唯一数据放回原表中。
注:如果表中有(所有列)完全重复的数据,那说明你的表创建的有问题,缺少主键。你应该学习一下创建数据表的三范式。

‘捌’ SQL语句怎么删除重复的数据

删除重复的数据
delete
from
tb
where
id
not
in
(
select
id
from
(select
fileSize,fileName
,max(id)
id
from
tb
group
by
filesize,filename
)
a
)
现在完成了重复数据的删除,主要是利用了找出某个分组中最大的那个id,其中包括了所有不重复的id,然后使用not
in将需要保留的排除。

‘玖’ sql去除重复的项

distinct
b,a,c
------是将b
a
c完全相的记录只取一条,你的数据里根本没有完全相同的记录,所以会全部输出;
你要的数据可以用下面的sql
select
*
from
(select
t.*,row_number()
over(partition
by
b
order
by
b)
numid
from
table
t)
a
where
a.numid=1;