Oracle重複資料刪除的資料，Oracle資料去重複_oracle

Oracle  資料庫中查詢重複資料：

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

 Oracle  查詢可以刪除的重複資料

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 重複資料刪除資料

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);