Question

我有存储日期时间的表...我需要使用mysql来计算0d 0h 0m 0s格式的持续时间以在数据表中显示它：

+----+---------------------+
| id | playtime            |
+----+---------------------+
|  2 | 08:58:24 20/06/2017 |
|  1 | 08:57:33 20/06/2017 |
+----+---------------------+

这是我的疑问：

SELECT (SELECT GROUP_CONCAT(                          
     TIMESTAMPDIFF(day, live.playtime, NOW()) , 'd ',                                

     MOD(TIMESTAMPDIFF(hour, live.playtime, NOW()), 24), 'h ',                           

     MOD(TIMESTAMPDIFF(minute, live.playtime, NOW()), 60), 'm ',                          

     MOD(TIMESTAMPDIFF(second, live.playtime, NOW()), 60), 's'                       
) FROM live) AS duration;

问题是只计算第一个id而忽略其他id。如何为每个id计算时间返回多个结果？

我需要回复：

+-----------------------------+
| duration                    |
+-----------------------------+
| 0d 0h 13m 50s,0d 0h 12m 59s |
+-----------------------------+
| 0d 0h 11m 12s,0d 0h 6m 9s   |
+-----------------------------+

更新完整查询：

SELECT SQL_CALC_FOUND_ROWS live.id, live.user, live.player, 
SUBSTRING_INDEX(streams.channel, '_', -1) AS channel, bouquets.bouquet, 
DATE_FORMAT(live.playtime, '%H:%i:%s %d/%m/%Y') AS playtime,                
    (SELECT CONCAT(                          
            TIMESTAMPDIFF(day, live.playtime, NOW()) , 'd ',                                

            MOD(TIMESTAMPDIFF(hour, live.playtime, NOW()), 24), 'h ',                           

            MOD(TIMESTAMPDIFF(minute, live.playtime, NOW()), 60), 'm ',                          

            MOD(TIMESTAMPDIFF(second, live.playtime, NOW()), 60), 's'                       
    ) FROM live GROUP BY live.id LIMIT 1) AS duration, 
resellers.nick, live.ip, servers.server, live.id, live.id             

FROM live LEFT JOIN streams ON live.stream=streams.id LEFT JOIN bouquets ON 
live.bouquet=bouquets.id LEFT JOIN resellers ON live.reseller=resellers.id 
LEFT JOIN servers ON live.server=servers.id        
ORDER BY live.id desc LIMIT 0, 10;

Answer 1

假设每个ID只有一条记录，您是否可以尝试在嵌套WHERE查询中添加SELECT子句，例如：

SELECT SQL_CALC_FOUND_ROWS live.id, live.user, live.player, 
SUBSTRING_INDEX(streams.channel, '_', -1) AS channel, bouquets.bouquet, 
DATE_FORMAT(live.playtime, '%H:%i:%s %d/%m/%Y') AS playtime,                
    (SELECT CONCAT(                          
            TIMESTAMPDIFF(day, l.playtime, NOW()) , 'd ',                                

            MOD(TIMESTAMPDIFF(hour, l.playtime, NOW()), 24), 'h ',                           

            MOD(TIMESTAMPDIFF(minute, l.playtime, NOW()), 60), 'm ',                          

            MOD(TIMESTAMPDIFF(second, l.playtime, NOW()), 60), 's'                       
    ) FROM live l WHERE l.id = live.id) AS duration, 
resellers.nick, live.ip, servers.server, live.id, live.id             

FROM live LEFT JOIN streams ON live.stream=streams.id LEFT JOIN bouquets ON 
live.bouquet=bouquets.id LEFT JOIN resellers ON live.reseller=resellers.id 
LEFT JOIN servers ON live.server=servers.id        
ORDER BY live.id desc LIMIT 0, 10;

MySQL只计算第一行

1 个答案: