Count number of post and total like per user in a range of time in MySQL

Question

I have 2 tables: members and posts

In table members , I have USERID for each user. In table posts , I have PID for each post and USERID of the user who created the post. Each post also has number_of_like , indicating how many times a post was liked.

/*Table: posts*/
----------------

Field              Type              Null    Key     Default         Extra          
-----------------  ----------------  ------  ------  ----------  --------------
PID                bigint(20)        NO      PRI     (NULL)      auto_increment
USERID             bigint(20)        NO              0                         
number_of_like     int(10) unsigned  YES             0                         
number_of_comment  int(10) unsigned  YES             0                         
date_added         date              NO              0000-00-00

Now I want to count that: in a range of time (DATE(date_added) > CURDATE() - INTERVAL 30 DAY) , each user have how many posts and the total like of them. I count by month and week.

Can I do that directly in a query? Or must I use foreach to count for each user, write it to a stats table and then SELECT from stats when needed?

Any help is really appreciated. Thank you :)

UPDATE

I need to list all users, regardless of their post count.

Answer 1

Yes, this can be done. Try something like this:

SELECT 
    U.USERID,
    COUNT(*),                <- total of posts per user
    SUM(A.number_of_like)    <- total of likes in these posts
FROM users U
LEFT JOIN posts A ON U.USERID = A.USERID
WHERE ISNULL(A.USERID) 
    OR A.date_added > DATE_ADD(CURDATE(), INTERVAL -30 DAY)
GROUP BY A.USERID;

I've used DATE_ADD for the date calculation, other date functions might be possible here, too.

Update:

After you've provided the detail you want every user (not only the ones that have posts), I've updated the SQL query above.