关于：数据去重复の话题！

Oracle删除重复的数据，Oracle数据去重复

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Oracle 数据库中查询重复数据：select * from employee group by emp_name having count (*)>1;Oracle 查询可以删除的重复数据select t1.* from employee t1 where (t1.emp_name) in (SELECT t2.emp_name from employee t2 group by emp_name havin..