‘壹’ mysql 怎么通过sql语句如何批量去掉某一个表中某一个字段的下面的相同部分字符串。
建议你用正则匹配
‘贰’ SQL语句求助：批量删除具有相同前缀的表
在phpmyadmin中先运行（假设前缀是"cdb_"）：
select concat('drop table ', table_name, ';')
from information_schema.tables;
where table_name like 'cdb_%'
然后把执行的结果从网页中复制出来，粘贴到记事本中，把记事本中的文件另存为：droptable.sql 。（文件类型中选“所有文件”）
在phpmyadmin中，顶部的菜单中，有“import”，点击后，你把新建的文件上传上去，然后点击右下方的“执行”
‘叁’ 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(*)>
‘肆’ sql server 中如何删除相同名字的信息
直接给你代码啦，--取重名
select * from table as t1 where exists(select 1 from table as t2 where t1.name = t2.name and t1.age <> t2.age)
--删重名
delete from table as t1 where exists(select 1 from table as t2 where t1.name = t2.name and t1.age <> t2.age)
‘伍’ 怎么使用SQL语句批量删除多个表的相同字段
在phpmyadmin中先运行（假设前缀是\"cdb_\"）：
select
concat(\'drop
table
\',
table_name,
\';\')
from
information_schema.tables;
where
table_name
like
\'cdb_%\'
然后把执行的结果从网页中复制出来，粘贴到记事本中，把记事本中的文件另存为：droptable.sql
。（文件类型中选“所有文件”）
在phpmyadmin中，顶部的菜单中，有“import”，点击后，你把新建的文件上传上去，然后点击右下方的“执行”
‘陆’ 如何在Sql中将重复的所有字段删除
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
‘柒’ 用SQL如何批量删除具有相同前缀的表sql批量删除表
alter proc DeleteSingleTable(@tablename varchar(100))
as
begin
declare @SQL varchar(2000)
declare @constraintName varchar(100)
declare curName cursor for
select name from sysobjects
where xtype = 'f ' and parent_obj =
(select [id] from sysobjects where [name]=@tablename and xtype = 'u ')
open curName
fetch next from curName into @constraintName
while @@fetch_status = 0
begin
set @SQL = 'alter table ' + @tablename + ' drop constraint '
set @SQL = @SQL + @constraintName
exec(@SQL)
fetch next from curName into @constraintName
end
close curName
deallocate curName
end