需要幫助MySQL，加入兩個查詢

Question

我正在運行WordPress，我想寫一個自定義查詢，顯示基於一個特定類別的帖子的月度存檔。我使用調試模式來了解如何根據所有帖子獲取每月歸檔，並選擇特定類別。下面是查詢：

獲取montlhy檔案：

SELECT YEAR(post_date) AS `year`, MONTH (post_date) AS `month`, 
    count(ID) as posts FROM wp_posts 
    WHERE post_type = 'post' AND post_status = 'publish' 
    GROUP BY YEAR(post_date), MONTH(post_date) ORDER BY post_date DESC 

選擇類別：

SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy 
    AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy 
    IN ('category') AND t.slug = 'blog' ORDER BY t.name ASC 

我無法弄清楚如何加入這兩個;）任何幫助表示讚賞！

謝謝。

更新：

還有涉及稱爲term_relationships另一個表，這樣就使得總共4桌。這裏的WordPress的數據庫結構的圖像：http://codex.wordpress.org/images/8/83/WP_27_dbsERD.png

不管怎麼說，這裏是我在哪裏：

SELECT t.*, tt.*, YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, 
    count(ID) as posts FROM wp_posts, wp_term_relationships AS tr, 
    wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id 
    WHERE tt.taxonomy IN ('category') AND t.slug = 'blog' 
    AND post_type = 'post' AND post_status = 'publish' 
    AND ID = tr.object_id AND tr.term_taxonomy_id = t.term_id 
    GROUP BY YEAR(post_date), MONTH(post_date) ORDER BY post_date DESC 

我知道這不是各地最好的方式，這就是爲什麼我需要你的幫助;）

謝謝。

Answer 1

如何像這樣作爲基礎，並加入其中，你需要增加條款：

SELECT 
     YEAR(post_date) AS `year`, 
     MONTH (post_date) AS `month`, 
     count(ID) as posts 
    FROM wp_posts 
    INNER JOIN wp_term_relationships wtr ON wp_posts.id = wtr.object_id 
    INNER JOIN wp_term_taxonomy wtt ON wtr.term_taxonomy_id = wtt.term_taxonomy_id 
    INNER JOIN wp_terms wt ON wtt.term_id = wt.term_id 
    WHERE post_type = 'post' AND post_status = 'publish' 
    AND wtt.taxonomy = 'category' 
    AND wt.name = 'enter category name here' 
    GROUP BY YEAR(post_date), MONTH(post_date) ORDER BY post_date DESC