SQL重复记录查询的几种具体相关方法
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,复制具体相关代码 具体相关代码如下:,select * from people where peopleId in (select peopleId from people group by peopleId having count,(peopleId) > 1),复制具体相关代码 具体相关代码如下:,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(peopl,)>1),复制具体相关代码 具体相关代码如下:,select * from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,,count(*) > 1),复制具体相关代码 具体相关代码如下:,delete from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,se,count(*) > 1) and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1,复制具体相关代码 具体相关代码如下:,select * from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,,count(*) > 1) and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1,复制具体相关代码 具体相关代码如下:,Select Name,Count(*) From A Group By Name having Count(*) > 1,复制具体相关代码 具体相关代码如下:,Select Name,sex,Count(*) From A Group By Name,sex having Count(*) > 1,复制具体相关代码 具体相关代码如下:,declare @max integer,@id integer declare cur_rows cursor local for select 主字段,count(*) from 表名 group,count(*) >； 1 open cur_rows fetch cur_rows into @id,@max while @@fetch_status=0 begin select @max = , 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,复制具体相关代码 具体相关代码如下:,select distinct * from tableName, 假如如果该表需要删除重复的记录（重复记录保留1条），可以按以下具体相关方法删除,复制具体相关代码 具体相关代码如下:,select distinct * into #Tmp from tableName drop table tableName select * into tableName from #Tmp dr, 2、这类重复问题通常要求保留重复记录中的第一条记录，操作办法具体相关方法如下, 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,复制具体相关代码 具体相关代码如下:,select identity(int,1,1) as autoID, * into #Tmp from tableName select min(autoID) as autoID into #Tm,在select子句中省去此列）,(四)查询重复,复制具体相关代码 具体相关代码如下:,select * from tablename where id in ( select id from tablename group by id having count(id) > 1 ),
问题：网站数据库附加.mdf网站网站文件时，提示无法打开物理网站网站文件，操作办法系统错误5:"5(拒绝访问)" 错误：5120。
解决方案： 网站数据库当前账户对存放.mdf网站网站文件的网站网站文件夹权限不足，该网站网站文件夹权限角色加入Everyone。并赋予读写权限即可。
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