1

我希望我能让自己足够了解！我有以下 SQL 查询

SELECT DATE_FORMAT(calendar_date,'%W %D, %M, %Y') AS calendar_date,calendar_entry_title,calendar_entry_teaser
        FROM calendar_month
        LEFT JOIN calendar_entry ON calendar_entry.calendar_id = calendar_month.calendar_id
        ORDER BY calendar_date

这是我正在处理的表格详细信息。

CREATE TABLE IF NOT EXISTS `calendar_entry` (
  `calendar_entry_id` int(11) NOT NULL AUTO_INCREMENT,
  `calendar_id` int(11) NOT NULL,
  `school_id` int(11) NOT NULL,
  `calendar_entry_title` varchar(250) NOT NULL,
  `calendar_entry_teaser` varchar(250) NOT NULL,
  `calendar_entry_text` text NOT NULL,
  PRIMARY KEY (`calendar_entry_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;

--
-- Dumping data for table `calendar_entry`
--

INSERT INTO `calendar_entry` (`calendar_entry_id`, `calendar_id`, `school_id`, `calendar_entry_title`, `calendar_entry_teaser`, `calendar_entry_text`) VALUES
(1, 1, 1, 'School Event 1', 'School event information 1', 'This would be the full body of the text that would show on the full page for this given entry'),
(2, 1, 1, 'School Event 2', 'School event information 2', 'This would be the full body of the text that would show on the full page for this given entry');



CREATE TABLE IF NOT EXISTS `calendar_month` (
  `calendar_id` int(11) NOT NULL AUTO_INCREMENT,
  `school_id` int(11) NOT NULL,
  `calendar_date` date NOT NULL,
  PRIMARY KEY (`calendar_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;

--
-- Dumping data for table `calendar_month`
--

INSERT INTO `calendar_month` (`calendar_id`, `school_id`, `calendar_date`) VALUES
(1, 1, '2012-08-11'),
(2, 1, '2012-08-12');

我遇到的问题是，calendar_month 表中只有 2 行。其中一行在month_entry 表中有2 行与之相关。当我运行我拥有的查询时，它将显示 3 行。我需要它做的只是显示 2 行，有两行的月份我需要显示为一行。这可以通过我的设置来完成吗？

谢谢

结果 -

Saturday 11th, August, 2012     School Event 1  School event information 1
Saturday 11th, August, 2012     School Event 2  School event information 2
Sunday 12th, August, 2012   NULL    NULL

我真正想要的——

Saturday 11th, August, 2012     School Event 1  School event information 1 School Event 2   School event information 2
Sunday 12th, August, 2012   NULL    NULL
4

2 回答 2

0

您无法仅在 mysql 中获得这种结果，或者为每行使用 2 个子查询，这迟早会使您的服务器崩溃。相反，使用 php 对结果进行排序并将您所在的 calendar_entry_title 存储在其中。例子：

$query =" SELECT DATE_FORMAT(calendar_date,'%W %D, %M, %Y') AS calendar_date,
calendar_entry_title,
calendar_entry_teaser
        FROM calendar_month
        LEFT JOIN calendar_entry ON calendar_entry.calendar_id = calendar_month.calendar_id
        ORDER BY calendar_date, calendar_entry_title";

$result = mysql_query($query);
$events = array();
foreach($result as $r){
     $events[$r['calendar_date']][] = $r;
}
echo '<pre>';
print_r($events);
echo '</pre>';
于 2012-08-12T00:24:01.983 回答
0

你试过了吗

SELECT DATE_FORMAT(calendar_date,'%W %D, %M, %Y') AS calendar_date, TMP.var1
FROM calendar_month
LEFT JOIN 
    (SELECT GROUP_CONCAT(calendar_entry_title, ' ',calendar_entry_teaser) AS var1, calendar_id
         FROM calendar_entry
     GROUP BY calendar_id) AS TMP ON TMP.calendar_id = calendar_month.calendar_id
ORDER BY calendar_date
于 2012-08-12T00:24:14.580 回答