MySQL的CONCAT腳本

Question

我想問一下，如果我有像下面

Date & Hour    Phone   Status 
2012-03-06 16:33:12  0292561234 Congestion 
2012-03-06 16:33:12  0292561234 Congestion 
2012-03-06 16:34:45  0292561234 Congestion 
2012-03-06 16:46:50  0292561234 Congestion 
2012-03-06 17:17:01  0292561234 Dial 
2012-03-07 12:01:39  500   Queue 
2012-03-07 12:02:10  500   Queue 
2012-03-07 12:03:06  500   Queue 

我要加入他們喜歡

Date & Hour    Phone   Status 
2012-03-06 16  0292561234 Congestion,Congestion,Congestion 
2012-03-06 17  0292561234 Dial 
2012-03-07 12  500   Queue,Queue,Queue 

所以我使用的是CONCAT條件

SELECT calldate, dst, GROUP_CONCAT(lastapp) 
FROM cdr 
GROUP BY hour(calldate) ; 

表

但它顯示爲

Date & Hour    Phone   Status 
2012-03-06 16:33:12  0292561234 Congestion,Congestion,Congestion,Dial 
2012-03-06 17:17:01  0292561234 Dial 
2012-03-07 12:01:39  500   Queue,Queue,Queue 

我使用錯誤的腳本嗎？

請注意。

謝謝

Answer 1

嘗試此查詢

SELECT DATE(calldate), dst, GROUP_CONCAT(lastapp) 
FROM tbl 
GROUP BY dst, DATE(calldate); 

參考http://www.mysqlperformanceblog.com/2006/09/04/group_concat-useful-group-by-extension/

Answer 2

嘗試以下：

SELECT SUBSTR(calldate,1,13) as date_hour, dst, GROUP_CONCAT(lastapp) 
FROM table 
GROUP BY date_hour 

Answer 3

這也將工作...

SELECT DATE_FORMAT(calldate,"%Y-%m-%d %h"), dst, GROUP_CONCAT(lastapp) 
FROM cdr 
GROUP BY hour(calldate) ;