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 程式師世界 >> 數據庫知識 >> Oracle數據庫 >> 關於Oracle數據庫 >> Oracle刪除重復的數據,Oracle數據去重復

Oracle刪除重復的數據,Oracle數據去重復

編輯:關於Oracle數據庫

Oracle  數據庫中查詢重復數據:

select * from employee group by emp_name having count (*)>1;

 Oracle  查詢可以刪除的重復數據

select t1.* from employee t1 where (t1.emp_name) in (SELECT t2.emp_name from employee t2 group by emp_name having count (*)>1) and t1.emp_id not in (select min(t3.emp_id) from employee t3 group by emp_name having count (*)>1);

Oracle 刪除重復數據

delete from employee t1 where (t1.emp_name) in (SELECT t2.emp_name from employee t2 group by emp_name having count (*)>1) and t1.emp_id not in (select min(t3.emp_id) from employee t3 group by emp_name having count (*)>1);

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