求sql语句,只修改重复数据中的一条记录
方法一用视图就可以啊
删除重复数据保留一条sql 删除重复记录保留一条sql
删除重复数据保留一条sql 删除重复记录保留一条sql
Score
create view v1(
A,B,C,D) as
select A,B,C,row_number() over(partition by A,B,C order by A) as D
from 表名
--这样就完全能满足你的要求 我测试过了,更新视图就完全可以了,楼主可以试试
数据库 ms sql2005下,
with aa as
(select row_number() over(partition by a,b,c order by a,b,c) as rn, from 表)
update aa set A=...
where rn=2
如果不管是否重复
with aa as
(select row_number() over(partition by a,b,c order by a,b,c) as rn, from 表)
update aa set A=...
where rn=1
Sql 表里面有2行数据完全一样,如何删除
FNumber int ,我遇到过这种情况,找了一个SQL语句:
select
distinct
into
#Tmp
drop
table
select
into
#Tmp
drop
table
#Tmp
上面语句可以把完全重复记录去掉。
还有个方法是在存储过程里直接执行delete语句,可以把完全重复记录删掉。
可以查看所有然后查到的信息每一条付给一个对象,然后循环比较对象里的值,如果值相同则移除一个对象也就是所谓删除!
重要的不是update v1 set A='新值A',B='新值B',C='新值C' WHERE D='1'代码
sql server 删除重复数据留一条记录在线等(追加100分)
ScoreOracle的话,可借助RowID:
DELETE
FROM st_iuc_d_t t
WHERE t.rowid > (SELECT MIN(r.ROWID)
FROM st_iuc_d_t r
WHERE t.store = r.store
AND t.barcode1 = r.barcode1
AND t.barcode2 = r.barcode2
AND t.barcode3 = r.barcode3
AND t.barcode4 = r.barcode4
AND t.barcode5 = r.barcode5
AND t.tran_time = r.tran_time
AND t.amt = r.amt
AND t.amt_type = r.amt_type )
用select distinct field,field1 from
建立一个临时表
删除原来数据,将临时表数据插入原来表,删除临时表
或者 baidu & google
Oracle的话,可借助RowID:
DELETE
FROM
s如果数据不重复的就不修改,则如下t_iuc_d_t
tWHERE
t.rowid
>(SELECT
MIN(r.ROWID)
FROM
st_iuc_d_t
rWHERE
t.store
=r.store
t.barcode1
=r.barcode1
t.barcode2
=r.barcode2
t.barcode3
=r.barcode3
t.barcode4
=r.barcode4
t.barcode5
=r.barcode5
t.tran_date
=r.tran_date
t.tran_time
=r.tran_time
t.amt
=r.amt
t.amt_type
=r.amt_type
delete from 表 where 主键=(select top 1 主键 from 表 where 相同字段=(select 相同字段 from 表 group by 相同字段 hing count()>1))
PLSQL如何删掉重复的数据保留只保留一条数据
这是最简单的一种情况,用关键字distinct就可以去掉。方法有很多了,每行都有的rowid,利用这个可以比较方便的达到目的,有问题再追问如果是这种情况的话用distinct是过滤不了的,这就要用到主键id的性特点及group by分组吧
delete from table a where rowid !=(select max(rowid) from table1 b where a.phid=b.phid and a.xzqbm=b.xzqbm and a.zdtybm=b.zdtybm...)
sql数据库 有多条记录完全重复,怎么删除重复记录,只保留一条,sql语句怎么写
ScoreDelete from tablename where id not in (select max(id) from
怎么写,最重要的是思路一定要清晰,其实电脑室最傻的~tablename group by col1,col2,...)
select distinct 重复字段名称 FROM 表
select distinct into 新表名 from 原表
select distinct from dual
sql删除重复数据 保留一条 FENTRYID
1,Select from stu a where not exists(select 1 from stu where stuName=a.stuName and IDcreate table A
(FEntryID INT ,
FIndex int,
FBasel int
);
-----插入数据
insert into A
select 169,1052,2,142 union all
select 169,1052,2,142
-------查询表A数据
select from A
-------查询,并且把结果导入到一个新的表B
select distinct into B from A
go
---------查询表B数据
select from B
go
drop table A
go
sql根据某一个字段重复只取条数据
ANDselect from tbl_DPImg where ID in (select min(ID) from tbl_DPImg group by DPID)
查找表中多余的重复记录,重复记录是根据单个字段(teamId)来判断
seAND t.tran_date = r.tran_daect from team where teamId in (select teamId from team group by teamId hing count(teamId) > 1)
delete from team where
teamName in(select teamName from team group by teamName hing count(teamName) > 1)
and teamId not in (select min(teamId) from team group by teamName hing count(teamName)>1)
扩展资料
数据记录筛选:
sql="select from 数据表 where字段名=字段值 order by字段名[desc]"(按某个字段值降序排列。默认升序ASC)
sql="select from 数据表 where字段名like '%字段值%' order by 字段名 [desc]"
sql="select top 10 from 数据表 where字段名=字段值 order by 字段名 [desc]"
sql="select top 10 from 数据表 order by 字段名 [desc]"
sql="select from 数据表 where字段名in ('值1','值2','值3')"
sql="select from 数据表 where字段名between 值1 and 值2"
参考资料来源:
sql删除重复数据 保留一条
一、对于种重复,比较容易解决,使用select distinct into #Tmp_aa from tableName 把不重复的找出来插入到临时表
2、这类重复问题通常要求保留重复记录中的条记录,作方法如下drop table tableName 删掉原来的表
select into tableName from #Tmp_aa 把临时表插入到新建的tableName
drop table #Tmp_aa 删掉临时 biao
顶一个
delete 表 a where a.rowid!=(select max(rowid) from 表 b where a.字段=b.字段)
选择的时候在某字段前加上distinct即可。
比如select distinct FEntryID from 表名。
在sql和Oracle中怎么实现删除表中某列有重复值的数据行?要求保留一条有重复的数据行。
就可以得到无重复记录的结果集。SQL
delete tabel from tabel a where exists(select from tabel where id Ordelete from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq hing count() > 1)acle delete from tabel a where exists(select from tabel where id delete from table where rowid not in (select max(rowid) from table group by name) Oracle中不用主键也可以删除重复的数据 oracle : delete from tablename a where rowid<>( select max(rowid) from tablename where name=a.name