通過組合數據查詢Sql group

Question

嗨，我有一個要求。我的表格中有以下數據。

ID  REASON      FLIGHT_KEY_ID   FLIGHT_NO       
1709 abcddf      0201_03/02/2016_MCT_BOM 201      
1704 Jump Seats     0201_03/02/2016_MCT_BOM 201      
1706 Others      0201_03/02/2016_MCT_BOM 201      
1717 Last minute immigration 0225_28/04/2016_MCT_COK 225      
1716 Last minute immigration 0225_28/04/2016_MCT_COK 225      
1705 Last minute immigration 0225_28/04/2016_MCT_COK 225 

結果應該是

REASON      FLIGHT_KEY_ID   FLIGHT_NO 
abcddf,Jump Seats,Jump Seats 0201_03/02/2016_MCT_BOM 201 
Last minute immigration  0225_28/04/2016_MCT_COK 225 

可我知道這可能嗎？任何幫助，將不勝感激。謝謝。

Answer 1

Listagg可能在您的版本中不可用。早期版本的Oracle提供了wm_concat作爲未記錄的功能。 （您自擔風險使用，注意這不是升級的路徑上（不存在12C））

SELECT 
    wm_Concat(distinct reason) reason, 
    FLIGHT_KEY_ID, 
    FLIGHT_NO 
FROM my_table 
GROUP BY FLIGHT_KEY_ID, FLIGHT_NO 

問湯姆： https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:9529613900346315631

Answer 2

您可以使用LISTAGG

注：ListAgg只能從Oracle版本11克;對於舊版本請參考xQbert答案;

嘗試;

select 
    LISTAGG(reason, ',') WITHIN GROUP (ORDER BY FLIGHT_NO) reason, 
    FLIGHT_KEY_ID, 
    FLIGHT_NO 
from my_table 
group by FLIGHT_KEY_ID, FLIGHT_NO 

如果只想distinctreasons即可;

select 
    LISTAGG(reason, ',') WITHIN GROUP (ORDER BY FLIGHT_NO) reason, 
    FLIGHT_KEY_ID, 
    FLIGHT_NO 
from (
    select 
     distinct reason, 
     FLIGHT_KEY_ID, 
     FLIGHT_NO 
    from my_table  
) 
group by FLIGHT_KEY_ID, FLIGHT_NO