每月WordPress的帖子数

Question

我需要在Wordpress中运行一个查询来获取每月有多少帖子，包括零。

我的查询现在返回什么，我试图返回第一部分：

select 
distinct date_format(post_date, '%y') "year", 
date_format(post_date, '%b') "month", 
from wp_posts 
where post_type = 'post' 
and post_status = 'publish' 
group by date_format(post_date, '%y'), date_format(post_date, '%b') 
order by date_format(post_date, '%y') desc, post_date 

它返回类似：

| year | month | count | 
------------------------------------ 
| 10  | Jan  |  4  | 
| 10  | Feb  |  2  | 
| 10  | Mar  |  1  | 
| 10  | Apr  |  6  | 
| 09  | Jan  |  4  | 
| 09  | Feb  |  2  | 

我需要返回类似：

| year | month | count | 
------------------------------------ 
| 10  | Jan  |  4  | 
| 10  | Feb  |  2  | 
| 10  | Mar  |  1  | 
| 10  | Apr  |  6  | 
| 10  | May  |  0  | 
| 10  | Jun  |  0  | 
| 10  | Jul  |  0  | 
| 10  | Aug  |  0  | 
| 10  | Sep  |  0  | 
| 10  | Oct  |  0  | 
| 10  | Nov  |  0  | 
| 10  | Dec  |  0  | 
| 09  | Jan  |  4  | 
| 09  | Feb  |  2  | 
| 09  | Mar  |  0  | 
| 09  | Apr  |  0  | 
| 09  | May  |  0  | 
| 09  | Jun  |  0  | 
| 09  | Jul  |  0  | 
| 09  | Aug  |  0  | 
| 09  | Sep  |  0  | 
| 09  | Oct  |  0  | 
| 09  | Nov  |  0  | 
| 09  | Dec  |  0  | 

我会在Oracle中使用rownum，但我无法弄清楚使用MySQL语法的查询。任何帮助是极大的赞赏。

Answer 1

这需要数表绝招 -

1. 创建一个表被叫号码：

   DROP TABLE IF EXISTS `example`.`numbers`; 
   CREATE TABLE `example`.`numbers` (
       `id` int(10) unsigned NOT NULL auto_increment, 
       PRIMARY KEY (`id`) 
   ) ENGINE=InnoDB DEFAULT CHARSET=latin1; 
   

2. 通过运行以下至少两个十几次填充表：

   INSERT INTO NUMBERS (id) VALUES (NULL) 
   

这将允许您使用生成日期列表：

SELECT DATE(DATE_ADD('2009-01-01', INTERVAL n.id MONTH)) AS dt 
    FROM NUMBERS n 

现在，你可以离开了加入当前的查询日期列表：

SELECT DATE_FORMAT(x.dt, '%y') "year", 
      DATE_FORMAT(x.dt, '%b') "month", 
      COUNT(*) AS count 
    FROM (SELECT DATE_ADD('2009-01-01', INTERVAL n.id MONTH) AS dt 
      FROM NUMBERS n) x 
LEFT JOIN WP_POSTS wp ON MONTH(wp.post_date) = MONTH(x.dt) 
        AND YEAR(wp.post_date) = YEAR(x.dt) 
        AND wp.post_type = 'post' 
        AND wp.post_status = 'publish' 
    WHERE YEAR(x.dt) IN (2009, 2010) 
GROUP BY DATE_FORMAT(x.dt, '%y'), DATE_FORMAT(x.dt, '%b') 
ORDER BY DATE_FORMAT(x.dt, '%y') DESC, MONTH(x.dt)