sql删除重复数据的详细方法

作者:计算机教程

利用DISTINCT得到单条记录,删除源数据,然后导回不重复记录。如果表不大的话,可以把所有记录导出一次,然后truncate表后再导回,这样可以避免delete的日志操作。复制代码 代码如下:if OBJECT_ID('tempdb..#tmp') is not nulldrop table #tmp GO select distinct * into #tmp from duplicate_all where c1 = 1 GO delete duplicate_all where c1 = 1 GO insert into duplicate_all select * from #tmp(2) 使用ROW_NUMBER复制代码 代码如下:with tmp as( select *,ROW_NUMBER() OVER(PARTITION BY c1,c2,c3 ORDER BY(getdate())) as num from duplicate_all where c1 = 1 ) delete tmp where num 1

查询及删除重复记录的SQL语句查询及删除重复记录的SQL语句1、查找表中多余的重复记录,重复记录是根据单个字段来判断复制代码 代码如下:select * from peoplewhere 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来判断,只留有rowid最小的记录复制代码 代码如下:delete from peoplewhere 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复制代码 代码如下:select * from vitae awhere (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,只留有rowid最小的记录复制代码 代码如下:delete from vitae awhere (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,不包含rowid最小的记录复制代码 代码如下:select * from vitae awhere (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

二. 删除部分重复的记录

(三)方法一复制代码 代码如下:declare @max integer,@id integerdeclare cur_rows cursor local for select 主字段,count(*) from 表名 group by 主字段 having count(*) ; 1open cur_rowsfetch cur_rows into @id,@maxwhile @@fetch_status=0beginselect @max = @max -1set rowcount @maxdelete from 表名 where 主字段 = @idfetch cur_rows into @id,@maxendclose cur_rowsset rowcount 0方法二"重复记录"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,可以按以下方法删除复制代码 代码如下:select distinct * into #Tmp from tableNamedrop table tableNameselect * into tableName from #Tmpdrop 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复制代码 代码如下:select identity(int,1,1) as autoID, * into #Tmp from tableNameselect min(autoID) as autoID into #Tmp2 from #Tmp group by Name,autoIDselect * 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(四)查询重复复制代码 代码如下:select * from tablename where id in (select id from tablenamegroup by idhaving count(id) 1)

部分列重复的数据,通常表上是有主键的,可能是程序逻辑造成了多行数据列值的重复。测试数据:复制代码 代码如下:if OBJECT_ID('duplicate_col') is not nulldrop table duplicate_col GO create table duplicate_col ( c1 int primary key, c2 int, c3 varchar(100) ) GO insert into duplicate_col select 1,100,'aaa' union allselect 2,100,'aaa' union allselect 3,100,'aaa' union allselect 4,100,'aaa' union allselect 5,500,'eee'GO

方法1复制代码 代码如下:delete YourTable where [id] not in ( select max([id]) from YourTable group by (name value)) 方法2复制代码 代码如下:delete a from 表 a left join( select id=min(id) from 表 group by name,value )b on a.id=b.id where b.id is null

(1) 借助临时表

例如: id name value 1 a pp 2 a pp 3 b iii 4 b pp 5 b pp 6 c pp 7 c pp 8 c iii id是主键 要求得到这样的结果 id name value 1 a pp 3 b iii 4 b pp 6 c pp 8 c iii

一. 删除完全重复的记录

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