無法從視圖中刪除沒有完全保存一個保存表的解決方法

Question

我有一個表x_visa。我想從此表中刪除重複的列。

我使用這個查詢是：

select * from (SELECT x_visa.*, 
       ROW_NUMBER() over (partition by effective_start_date, effective_end_date, person_id, 
        business_group_id, legislation_code , current_visa_permit, visa_permit_type, visa_permit_id, configuration_id 
       order by person_id) AS rn 
     from x_visa) T 
WHERE rn > 1); 

DELETE語句給了一個錯誤：ORA-01752：無法從視圖中刪除，也不一定是一個關鍵的保存完好的表

delete from 
(select * from (SELECT x_visa.*, 
       ROW_NUMBER() over (partition by effective_start_date, effective_end_date, person_id, 
        business_group_id, legislation_code , current_visa_permit, visa_permit_type, visa_permit_id, configuration_id 
       order by person_id) AS rn 
     from x_visa) T 
WHERE rn = 1); 

是否有解決方法來刪除此表中的重複數據？

Answer 1

每一行都有rowid標識符。因此，您可以刪除查詢結果中的rowid。

delete from x_visa where rowid in (/*YOUR QUERY*/); 

因此，我們有：

delete from x_visa where rowid in (select r from (SELECT x_visa.rowid r, x_visa.*, 
       ROW_NUMBER() over (partition by effective_start_date, effective_end_date, person_id, 
        business_group_id, legislation_code , current_visa_permit, visa_permit_type, visa_permit_id, configuration_id 
       order by person_id) AS rn 
     from x_visa) T 
WHERE rn > 1))