SQL查詢的藝術學習筆記--數據的更新和刪除

use seldata --補充：刪除表中的重複記錄 select * from course  where cno in (select cno from course group by cno having COUNT(cno)>1) --查詢表中行大於1(重複)的記錄 select distinct * into #temp from teacher delete teacher go in

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