我正在使用Wordpress,我正在尝试实现一个返回下表的查询：
+------------+------------+------------+
| name | posts | views |
|------------|------------|------------|
| politics | 10 | 311 |
|------------|------------|------------|
| economy | 20 | 764 |
|------------|------------|------------|
| gossip | 15 | 551 |
|------------|------------|------------|
| entertain | 2 | 117 |
|------------|------------|------------|
| fun | 7 | 249 |
+------------+------------+------------+
views字段是每个类别中有多少个视图的帖子,posts字段是每个类别中有多少帖子.
views表具有以下结构：
view_id (INT)
view_date (DATETIME)
view_post_id (INT)
我正在使用这种结构,因为我需要知道每次访问的日期.查看帖子时,会在此表中注册.
目前,我可以使用以下查询获取某个类别中的帖子数量：
SELECT wp_terms.name,
count(wp_term_relationships.object_id) AS num_posts
FROM wp_term_taxonomy
JOIN wp_terms ON wp_term_taxonomy.term_id = wp_terms.term_id
JOIN wp_term_relationships ON wp_term_taxonomy.term_taxonomy_id = wp_term_relationships.term_taxonomy_id
JOIN wp_posts ON (wp_term_relationships.object_id = wp_posts.id AND wp_term_taxonomy.taxonomy='category' AND post_type='post' AND post_status='publish')
GROUP BY wp_terms.term_id
ORDER BY name ASC
我可以使用以下查询获取每个帖子的观看次数.
SELECT view_post_id, COUNT(view_id) as total_views, ID, post_title FROM wp_views JOIN wp_posts ON (view_post_id = ID AND post_status = 'publish') GROUP BY view_post_id
但我无法弄清楚如何合并它们.我甚至都不知道这是不是一个好主意,因为查询可能非常繁重.
你建议使用两个查询吗？如果是这样,我怎么能加入到第二个,因为这是我的第一个问题.
谢谢！
UPDATE
这是SQL转储.
CREATE TABLE IF NOT EXISTS `wp_posts` (
`ID` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`post_author` bigint(20) unsigned NOT NULL DEFAULT '0',
`post_date` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
`post_date_gmt` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
`post_content` longtext NOT NULL,
`post_title` text NOT NULL,
`post_excerpt` text NOT NULL,
`post_status` varchar(20) NOT NULL DEFAULT 'publish',
`comment_status` varchar(20) NOT NULL DEFAULT 'open',
`ping_status` varchar(20) NOT NULL DEFAULT 'open',
`post_password` varchar(20) NOT NULL DEFAULT '',
`post_name` varchar(200) NOT NULL DEFAULT '',
`to_ping` text NOT NULL,
`pinged` text NOT NULL,
`post_modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
`post_modified_gmt` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
`post_content_filtered` text NOT NULL,
`post_parent` bigint(20) unsigned NOT NULL DEFAULT '0',
`guid` varchar(255) NOT NULL DEFAULT '',
`menu_order` int(11) NOT NULL DEFAULT '0',
`post_type` varchar(20) NOT NULL DEFAULT 'post',
`post_mime_type` varchar(100) NOT NULL DEFAULT '',
`comment_count` bigint(20) NOT NULL DEFAULT '0',
PRIMARY KEY (`ID`),
KEY `post_name` (`post_name`),
KEY `type_status_date` (`post_type`,`post_status`,`post_date`,`ID`),
KEY `post_parent` (`post_parent`),
KEY `post_author` (`post_author`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=14 ;
INSERT INTO `wp_posts` (`ID`, `post_author`, `post_date`, `post_date_gmt`, `post_content`, `post_title`, `post_excerpt`, `post_status`, `comment_status`, `ping_status`, `post_password`, `post_name`, `to_ping`, `pinged`, `post_modified`, `post_modified_gmt`, `post_content_filtered`, `post_parent`, `guid`, `menu_order`, `post_type`, `post_mime_type`, `comment_count`) VALUES
(5, 1, '2010-11-26 16:23:54', '2010-11-26 16:23:54', '', 'fun post #1', '', 'publish', 'open', 'open', '', 'fun-post-1', '', '', '2010-11-26 16:23:54', '2010-11-26 16:23:54', '', 0, 'http://devcake/?p=5', 0, 'post', '', 0),
(7, 1, '2010-11-26 16:24:09', '2010-11-26 16:24:09', '', 'entertainment & fun post', '', 'publish', 'open', 'open', '', 'entertainment-fun-post', '', '', '2010-11-26 16:24:09', '2010-11-26 16:24:09', '', 0, 'http://devcake/?p=7', 0, 'post', '', 0),
(9, 1, '2010-11-26 16:24:24', '2010-11-26 16:24:24', '', 'entertainment & politics', '', 'publish', 'open', 'open', '', 'entertainment-politics', '', '', '2010-11-26 16:24:24', '2010-11-26 16:24:24', '', 0, 'http://devcake/?p=9', 0, 'post', '', 0),
(11, 1, '2010-11-26 16:24:34', '2010-11-26 16:24:34', '', 'gossip', '', 'publish', 'open', 'open', '', 'gossip', '', '', '2010-11-26 16:24:35', '2010-11-26 16:24:35', '', 0, 'http://devcake/?p=11', 0, 'post', '', 0);
CREATE TABLE IF NOT EXISTS `wp_terms` (
`term_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(200) NOT NULL DEFAULT '',
`slug` varchar(200) NOT NULL DEFAULT '',
`term_group` bigint(10) NOT NULL DEFAULT '0',
PRIMARY KEY (`term_id`),
UNIQUE KEY `slug` (`slug`),
KEY `name` (`name`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=8 ;
INSERT INTO `wp_terms` (`term_id`, `name`, `slug`, `term_group`) VALUES
(1, 'Uncategorized', 'uncategorized', 0),
(2, 'Blogroll', 'blogroll', 0),
(3, 'politics', 'politics', 0),
(4, 'economy', 'economy', 0),
(5, 'gossip', 'gossip', 0),
(6, 'entertainment', 'entertainment', 0),
(7, 'fun', 'fun', 0);
CREATE TABLE IF NOT EXISTS `wp_term_relationships` (
`object_id` bigint(20) unsigned NOT NULL DEFAULT '0',
`term_taxonomy_id` bigint(20) unsigned NOT NULL DEFAULT '0',
`term_order` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`object_id`,`term_taxonomy_id`),
KEY `term_taxonomy_id` (`term_taxonomy_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
INSERT INTO `wp_term_relationships` (`object_id`, `term_taxonomy_id`, `term_order`) VALUES
(1, 2, 0),
(2, 2, 0),
(3, 2, 0),
(4, 2, 0),
(5, 2, 0),
(6, 2, 0),
(7, 2, 0),
(1, 1, 0),
(5, 7, 0),
(7, 7, 0),
(7, 6, 0),
(9, 6, 0),
(9, 3, 0),
(11, 5, 0);
CREATE TABLE IF NOT EXISTS `wp_term_taxonomy` (
`term_taxonomy_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`term_id` bigint(20) unsigned NOT NULL DEFAULT '0',
`taxonomy` varchar(32) NOT NULL DEFAULT '',
`description` longtext NOT NULL,
`parent` bigint(20) unsigned NOT NULL DEFAULT '0',
`count` bigint(20) NOT NULL DEFAULT '0',
PRIMARY KEY (`term_taxonomy_id`),
UNIQUE KEY `term_id_taxonomy` (`term_id`,`taxonomy`),
KEY `taxonomy` (`taxonomy`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=8 ;
INSERT INTO `wp_term_taxonomy` (`term_taxonomy_id`, `term_id`, `taxonomy`, `description`, `parent`, `count`) VALUES
(1, 1, 'category', '', 0, 0),
(2, 2, 'link_category', '', 0, 7),
(3, 3, 'category', '', 0, 1),
(4, 4, 'category', '', 0, 0),
(5, 5, 'category', '', 0, 1),
(6, 6, 'category', '', 0, 2),
(7, 7, 'category', '', 0, 2);
CREATE TABLE IF NOT EXISTS `wp_views` (
`view_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`view_post_id` int(10) DEFAULT NULL,
`view_date` datetime DEFAULT NULL,
PRIMARY KEY (`view_id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=11 ;
INSERT INTO `wp_views` (`view_id`, `view_post_id`, `view_date`) VALUES
(1, 11, '2010-11-26 16:28:52'),
(2, 9, '2010-11-26 16:28:56'),
(3, 7, '2010-11-26 16:31:54'),
(4, 7, '2010-11-26 16:31:55'),
(5, 7, '2010-11-26 16:31:56'),
(6, 5, '2010-11-26 16:31:58'),
(7, 5, '2010-11-26 16:31:59'),
(8, 5, '2010-11-26 16:31:59'),
(9, 5, '2010-11-26 16:32:00'),
(10, 5, '2010-11-26 16:32:00');
按类别计算(问题中的第一个查询)应该是这样的：
+---------------+-----------+
| name | num_posts |
|---------------|-----------|
| entertainment | 2 |
|---------------|-----------|
| fun | 2 |
|---------------|-----------|
| gossip | 1 |
|---------------|-----------|
| politics | 1 |
+---------------+-----------+
视图计数应该返回类似的东西
+---------------+-------------+----+--------------------------+
| view_post_id | total_views | ID | post_title |
|---------------|-------------|----|--------------------------|
| 5 | 5 | 5 | fun post #1 |
|---------------|-------------|----|--------------------------|
| 7 | 3 | 7 | entertainment & fun post |
|---------------|-------------|----|--------------------------|
| 9 | 1 | 9 | entertainment & politics |
|---------------|-------------|----|--------------------------|
| 11 | 1 | 11 | gossip |
+---------------+-------------+----+--------------------------+
而我正在寻找的查询将返回如下内容：
+------------+------------+------------+
| name | posts | views |
|------------|------------|------------|
| politics | 1 | 1 |
|------------|------------|------------|
| gossip | 1 | 1 |
|------------|------------|------------|
| entertain | 2 | 4 |
|------------|------------|------------|
| fun | 2 | 8 |
+------------+------------+------------+
请注意,fun有两个帖子,一个有5个视图,一个有3个,此类别总共有8个.
谢谢.
最佳答案 这对你有什么用？
SELECT wp_terms.name,
COUNT(wp_term_relationships.object_id) AS num_posts,
SUM(total_views) AS num_views
FROM wp_term_taxonomy
JOIN wp_terms ON wp_term_taxonomy.term_id = wp_terms.term_id
JOIN wp_term_relationships ON wp_term_taxonomy.term_taxonomy_id = wp_term_relationships.term_taxonomy_id
JOIN wp_posts ON (wp_term_relationships.object_id = wp_posts.id AND wp_term_taxonomy.taxonomy='category' AND post_type='post' AND post_status='publish')
JOIN (
SELECT COUNT(*) as total_views, view_post_id
FROM wp_views
GROUP BY view_post_id
) wpv ON wpv.view_post_id=wp_posts.id
GROUP BY wp_terms.term_id
ORDER BY name ASC
Re：我甚至不知道这是不是一个好主意,因为查询可能非常繁重.
查询的沉重程度取决于您的数据和索引.如果执行速度低于可接受的速度,请随意使用生成的EXPLAIN更新您的帖子(或创建一个新帖子).无论如何,如果你可以在某处缓存结果(在MySQL,磁盘或内存缓存中的报告/临时表)并且只定期计算它(并且不是每次都计算它),你应该没问题.
