Question

I have the following two tables:

Posts

• post_id
• post_title
• post_timestamp

Comments

• comment_id
• posts_post_id
• comment_content
• comment_timestamp

I want to create a report that shows the weekly post count and comment count. Something like this:

Week    StartDate      Posts     Comments
1       1/1/2012       100        305
2       1/8/2012       115        412

I have this query but it only pulls form the Posts table.

select makedate( left(yearweek(p.post_timestamp),1),week(p.post_timestamp, 2 ) * 7 ) as Week, COUNT(p.post_id) as Posts  
FROM cl_posts p
GROUP BY Week
ORDER BY WEEK(p.post_timestamp)

How do I add the Comment count too?

Answer 1

I think you need something like this:

select
  week(post_timestamp) as Week,
  adddate(date(post_timestamp), INTERVAL 1-DAYOFWEEK(post_timestamp) DAY) as StartDate,
  count(distinct post_id),
  count(comment_id)
from
  posts left join comments
  on comments.posts_post_id = posts.post_id
group by Week, StartDate