Mysql的共有來自兩個日期

Question

經過的時間，如果我有兩排

id created   start   stop 
1 28-01-2011 23:00 28-01-2011 23:00 28-01-2011 23:01 
2 28-01-2011 23:10 28-01-2011 23:10 28-01-2011 23:11 

我可以運行什麼查詢來獲取總時間爲一個日期，所以28-01-2011的總時間爲2分鐘。

這可能嗎？

Answer 1

以及一個選擇是直截了當：

select sum(unix_timestamp(stop) - 
    unix_timestamp(start))/60 from table 
    where date(created) = '28-01-2011'; 

mysql> select now(), date_add(now(), interval 10 minute); 
+---------------------+-------------------------------------+ 
| now()    | date_add(now(), interval 10 minute) | 
+---------------------+-------------------------------------+ 
| 2011-10-04 13:29:56 | 2011-10-04 13:39:56     | 
+---------------------+-------------------------------------+ 
1 row in set (0.01 sec) 

mysql> select sum(unix_timestamp(now()) - 
      unix_timestamp(date_add(now(), interval 10 minute))); 
+----------------------------------------------------------------------------------+ 
| sum(unix_timestamp(now()) - unix_timestamp(date_add(now(), interval 10 minute))) | 
+----------------------------------------------------------------------------------+ 
|                    -600 | 
+----------------------------------------------------------------------------------+ 
1 row in set (0.00 sec) 


mysql> select sum(unix_timestamp(now()) - 
      unix_timestamp(date_add(now(), interval 10 minute)))/60 ; 
+---------------------------------------------------------------------------------------+ 
| sum(unix_timestamp(now()) - unix_timestamp(date_add(now(), interval 10 minute)))/60 | 
+---------------------------------------------------------------------------------------+ 
|                    -10.0000 | 
+---------------------------------------------------------------------------------------+ 
1 row in set (0.00 sec)