查詢兩次與MySQL表按小時

Question

來算總主題

我的論壇有兩個表來存儲主題（職位和forums_archive_posts）

$this->DB->build(array(
            'select' => "HOUR(FROM_UNIXTIME(post_date)) as hour, COUNT(*) AS postCount", 
            'from'  => 'posts', 
            'where'  => "new_topic=0 AND author_id=" . $member['member_id'], 
            'group'  => 'HOUR(FROM_UNIXTIME(post_date))', 
         )  ); 

這個查詢只能與第一個表（文章），我需要一個查詢其工作原理也在 「forum_archive_posts」

表結構（forum_archive_posts =帖）：

archive_author_id = AUTHOR_ID

archive_content_date = POST_DATE

Answer 1

不知道你是如何在這種格式做，但像

Select postHour, sum(postcount) as postCount From 
(
    select Hour ... as PostHour 
    From 
    Posts... 
    Union 
    Select Hour ... 
    From 
    ForumArchivePosts ... 
) dummyTableName 
Group by PostHour 

應該做的工作。這兩個表格都會計數，然後將它們加在一起。