去除表中的重複記錄,但每個重複的保留一項

這類重複問題通常要求保留重複記錄中的第一條記錄，操作方法如下

　　假設有重複的字段爲Name,Address，要求得到這兩個字段唯一的結果集

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)