Question

I want to have an only query with 2 queries but i don’t know how to start…
My queries count the positive/negative votes for a comment.

SELECT COUNT(id) AS votes_no FROM comments_votes WHERE vote = 0 AND id_comment = 1
SELECT COUNT(id) AS votes_no FROM comments_votes WHERE vote = 1 AND id_comment = 1

I set vars to put negative and positives votes : $votes_no and $votes_yes

Then i have a final var : $votes_calc = $votes_yes - $votes_no;

How can i get the number of votes_yes, votes_no and votes_calc in only one query?

Thanks a lot!

Answer 1

select votes_no, votes_yes, votes_yes-votes_no as votes_calc
from (select sum(case when vote = 0 then 1 else 0 end) as votes_no,
             sum(case when vote = 1 then 1 else 0 end) as votes_yes
      from comments_votes
      where id_comment = 1) a