sql 查詢去掉冗餘數據

一、刪除重複數據ide with aaa as   (select ROW_NUMBER() over(partition by materialid order by materialid) ordernum,* from cc  )spa delete from aaa where ordernum<=1.net     二、it 選擇重複，消除重複和選擇出序列  有例表：emp  emp_n

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