Double join if row in third table matches where clause - mysql

Question

I have a game server, and I want to get a list of the most-ignored player accounts.
I have a user table
Table1 - Users:
Name | ID | otherstuff
Troll | 1 | .
CoolGuy | 2 | .
I have an ignore table
Table2 - Ignores
id_UserWhoIsIgnoring | id_UserWhoIsIgnored
2 | 1
3 | 1
Now this is all great, and I can do something like:
select
u.name,
ig.id_UserWhoIsIgnored,
count(ig.id_UserWhoIsIgnored) as ignoreCount
from ignores ig
inner join users u
on ig.id_UserWhoIsIgnored = u.id
group by id_UserWhoIsIgnored
order by ignoreCount desc
limit 25;
But the problem with this is that I get accounts of users who haven't connected in a really long time. I'd like to limit my query to users connected in the past 30 days. I have a third table, sessions
Table3 - Sessions
id_user | start_time | otherstuff
1 | 2014-06-25 00:00:00 | .
(id)OldTroll | 2010-01-01 00:00:00 | .
How can I combine my first query giving the list but restrict it only cases where start_time > date_sub(now(), interval 45 days) gives me a result for id. In this case I don't want a row showing OldTroll even if they're the most ignored because their most recent connection is years old.

Answer 1

If start_time is in the users table, then just use a where:
select u.name, ig.id_UserWhoIsIgnored, count(ig.id_UserWhoIsIgnored) as ignoreCount
from ignores ig inner join
users u
on ig.id_UserWhoIsIgnored = u.id
where start_time > date_sub(now(), interval 45 days)
group by id_UserWhoIsIgnored
order by ignoreCount desc
limit 25;
If start_time is in the ignores table, then just use having:
select u.name, ig.id_UserWhoIsIgnored, count(ig.id_UserWhoIsIgnored) as ignoreCount
from ignores ig inner join
users u
on ig.id_UserWhoIsIgnored = u.id
group by id_UserWhoIsIgnored
having max(start_time) > date_sub(now(), interval 45 days)
order by ignoreCount desc
limit 25;
EDIT:
Then I presume you want:
select u.name, ig.id_UserWhoIsIgnored, count(ig.id_UserWhoIsIgnored) as ignoreCount
from ignores ig inner join
users u
on ig.id_UserWhoIsIgnored = u.id inner join
(select id_user, max(start_time) as start_time
from sessions
group by id_user
) s
on u.id_user = s.id_user and
s.start_time >= date_sub(now(), interval 45 days)
group by id_UserWhoIsIgnored
order by ignoreCount desc
limit 25;