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 * from tablename 就可以得到無重復(fù)記錄的結(jié)果集。
如果該表需要刪除重復(fù)的記錄（重復(fù)記錄保留1條），可以按以下方法刪除
select distinct * into #tmp from tablename drop table tablename select * into tablename from #tmp drop table #tmp 發(fā)生這種重復(fù)的原因是表設(shè)計不周產(chǎn)生的，增加唯一索引列即可解決。
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) 最后一個select即得到了name，address不重復(fù)的結(jié)果集（但多了一個autoid字段，實際寫時可以寫在select子句中省去此列）
