ExpressEngine：自定义查询-每天对条目进行分组

Question

我有以下查询，每天对哪些条目进行分组和计数：

SELECT DISTINCT `year`, `month`, `day`, count(entry_id) as 'posts'
FROM (`exp_channel_titles`)
WHERE `status` =  'open'
GROUP BY `year`, `month`, `day`
ORDER BY `entry_date` desc  

它工作正常，但是它从所有类别中选择，但是我想限制为一个或多个类别。

对于不熟悉EE数据库的人，这里有一些我们可能需要的表格示例

exp_channel_titles：

entry_id year month day
1 2011 11 5
2 2011 11 6
3 2011 11 7

exp_categories：

cat_id cat_name
1 sport
2 computer
3 car

exp_category_posts：将条目连接到类别

entry_id cat_id
1 2
1 2
2 1
3 3

Answer 1

SELECT ect.year, ect.month, ect.day, count(ect.entry_id) as posts
FROM exp_channel_titles as ect
INNER JOIN exp_category_posts ecp
  ON ecp.entry_id=ect.entry_id
INNER JOIN exp_categories ec
  ON ecp.cat_id=ec.cat_id
WHERE ect.status = 'open' 
  AND ec.cat_name = "computer" /* this is to filter by category name */
GROUP BY ect.year, ect.month, ect.day
ORDER BY ect.entry_date desc;  /* where is this entry_date come from? */