DELETE FROM jc_company where name IN (  SELECT   t.name  FROM   (    SELECT     name    FROM     jc_company    GROUP BY     name    HAVING     count(1) > 1   ) t )AND id NOT IN (SELECT dt.mindeptno FROM (  SELECT   min(id) AS mindeptno  FROM   jc_company  GROUP BY   name  HAVING   count(1) > 1 ) dt)

表名 company
重復(fù)列 name
索引 id