declare @max integer,@id integer declare cur_rows cursor
local for select 主字段,count(*) from 表名 group by 主字段 having count(*)
> 1 open cur_rows fetch cur_rows into @id,@max while
@@fetch_status=0 begin select @max = @max -1 set rowcount
@max delete from 表名 where 主字段 = @id fetch cur_rows into
@id,@max end close cur_rows set rowcount
0 方法二
select distinct * into #Tmp from tableName drop table
tableName select * into tableName from #Tmp drop 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
select identity(int,1,1) as autoID, * into #Tmp from
tableName select min(autoID) as autoID into #Tmp2 from #Tmp group by
Name,autoID select * 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(但多了一个autoID字段,实际写时可以写在select子句中省去此列)