sql刪除重複行

一、刪除重複行 如何只顯示重複數據，或不顯示重複數據 顯示重複：select id from tablename group by id having count(*)>1 顯示未重複：select id from tablename group by id having count(*)=1 --找出重複行 select empno, count(*) from emp e group by e

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