MYSQL - 拼合我有以下查詢的一些問題表查詢

Question

，我不確定如何修改它給我所期望的輸出，下文中詳細說明：輸出是

SELECT listup.NodeNumber As Node, listup.Station As Extension, 
     CASE WHEN VoiceServer = 1 THEN KeyDescription ELSE '' END AS 'Key1', 
     CASE WHEN VoiceServer = 2 THEN KeyDescription ELSE '' END AS 'Key2', 
     CASE WHEN VoiceServer = 3 THEN KeyDescription ELSE '' END AS 'Key3', 
     CASE WHEN VoiceServer = 4 THEN KeyDescription ELSE '' END AS 'Key4', 
     CASE WHEN VoiceServer = 5 THEN KeyDescription ELSE '' END AS 'Key5', 
     CASE WHEN VoiceServer = 6 THEN KeyDescription ELSE '' END AS 'Key6', 
     CASE WHEN VoiceServer = 7 THEN KeyDescription ELSE '' END AS 'Key7', 
     CASE WHEN VoiceServer = 8 THEN KeyDescription ELSE '' END AS 'Key8', 
     CASE WHEN VoiceServer = 9 THEN KeyDescription ELSE '' END AS 'Key9', 
     CASE WHEN VoiceServer = 10 THEN KeyDescription ELSE '' END AS 'Key10' 
    FROM listup 
ORDER BY listup.NodeNumber, listup.Station; 

如下：

Node Extension Key1 Key2 Key3 etc. 
N100 14311 14311          
N100 14311  14308         
N100 14311   14309        
N100 14311    14314       
N100 14311     14412      
N100 14311      14535     
N100 14311       14316    
N100 14311        14456   
N100 14312 14312          
N100 14312  14442         
N100 14312   14311        
N100 14312    14314       
N100 14312     14456      
N100 14312      14309     
N100 14312       14308    

我想擁有這一切出現在同一行，所以扁平化這樣.. 如。

N100 14311 14311 14308 14309 14314 14412 14535 14316 14456 
N100 14312 14312 14442 14311 14314 14456 14309 14308 

Answer 1

您需要定義一個GROUP BY條款，並使用MAX合計得到你想要的輸出：

SELECT listup.NodeNumber As Node, listup.Station As Extension, 
     MAX(CASE WHEN VoiceServer = 1 THEN KeyDescription ELSE NULL END) AS 'Key1', 
     MAX(CASE WHEN VoiceServer = 2 THEN KeyDescription ELSE NULL END) AS 'Key2', 
     MAX(CASE WHEN VoiceServer = 3 THEN KeyDescription ELSE NULL END) AS 'Key3', 
     MAX(CASE WHEN VoiceServer = 4 THEN KeyDescription ELSE NULL END) AS 'Key4', 
     MAX(CASE WHEN VoiceServer = 5 THEN KeyDescription ELSE NULL END) AS 'Key5', 
     MAX(CASE WHEN VoiceServer = 6 THEN KeyDescription ELSE NULL END) AS 'Key6', 
     MAX(CASE WHEN VoiceServer = 7 THEN KeyDescription ELSE NULL END) AS 'Key7', 
     MAX(CASE WHEN VoiceServer = 8 THEN KeyDescription ELSE NULL END) AS 'Key8', 
     MAX(CASE WHEN VoiceServer = 9 THEN KeyDescription ELSE NULL END) AS 'Key9', 
     MAX(CASE WHEN VoiceServer = 10 THEN KeyDescription ELSE NULL END) AS 'Key10' 
    FROM listup 
GROUP BY listup.NodeNumber As Node, listup.Station As Extension 
ORDER BY listup.NodeNumber, listup.Station 

NULL最好是零長度字符串。