Question

我有两个mysql表“films”和“showtime”，查询'$ place_id = 2'和'$ date = 2013-11-22'的变量作为示例。

showtime表有colomns'id'，'film_id'，'place_id'，'hall_id'，'time'，'date';

电影表有colomns'id'，'title';

我用左连接写了一个查询，因为我认为一个查询比几个更好：

SELECT `showtime`.`id`, `showtime`.`film_id`, `showtime`.`place_id`,
`showtime`.`hall_id`, `showtime`.`time`, `showtime`.`date`, `films`.`id`, 
`films`.`title` FROM (`showtime`)
LEFT JOIN `films` ON `films`.`id` = `showtime`.`film_id`
WHERE `showtime`.`date` = '2013-11-22' AND `showtime`.`place_id` = '2'
ORDER BY `films`.`title` asc, `showtime`.`time` asc

作为这个查询的结果我得到了这个：

print_r($result):

Array (
[0] => stdClass Object (
[id] => 4 [film_id] => 4 [place_id] => 2 [hall_id] => 2 [time] => 09:00:00
[date] => 2013-11-22 [title] => Hunger Games 2 )
[1] => stdClass Object ( [id] => 4 [film_id] => 4 [place_id] => 2 [hall_id] => 2
[time] => 22:30:00 [date] => 2013-11-22 [title] => Hunger Games 2 )
[2] => stdClass Object ( [id] => 1 [film_id] => 1 [place_id] => 2 [hall_id] => 2
[time] => 09:00:00 [date] => 2013-11-22 [title] => Thor 2 )
[3] => stdClass Object ( [id] => 1 [film_id] => 1 [place_id] => 2 [hall_id] => 2
[time] => 11:00:00 [date] => 2013-11-22 [title] => Thor 2 ) )

使用默认的foreach我有这样的表：

Title          | Time
__________________________________
Hunger games 2 | 09:00:00
__________________________________
Hunger games 2 | 22:30:00
__________________________________
Thor 2         | 09:00:00
__________________________________
Thor 2         | 11:00:00

我如何在php中按标题对结果进行分组，以获得这样的html表：

Title          | Time
__________________________________
Hunger games 2 | 09:00:00 22:30:00
__________________________________
Thor 2         | 09:00:00 11:00:00

有什么建议吗？可能是我选择了错误的查询方法？从复杂的连接查询中解析结果的更好方法是什么？谢谢！

Answer 1

假设查询仅用于生成表格，您可以使用GROUP BY和GROUP_CONCAT：

SELECT `films`.`title` 
GROUP_CONCAT(`showtime`.`time`) AS filmtime
FROM (`showtime`)
LEFT JOIN `films` ON `films`.`id` = `showtime`.`film_id`
WHERE `showtime`.`date` = '2013-11-22' AND `showtime`.`place_id` = '2'
GROUP BY films.id
ORDER BY `films`.`title` asc, `showtime`.`time` asc

会产生类似于第二张表的结果。您可以在当前循环中使用它。

Answer 2

尝试使用mysql GROUP_CONCAT函数：

http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat

使用左连接的Mysql查询并在html表中显示结果

2 个答案: