Question

I’m making a little voting tool (voting from 1 to 5) and I have the votes stored in a DB. I’m wondering, what is the best manner to count all the rows (of a specific post ID) and then calculate the sum of those specific rows so that I can display the results.

i.e

Results: 3.5 / 5
(total votes: 1047)

Should I use a PHP loop or MYSQL sum?

Answer 1

SELECT AVG(vote), COUNT(vote) FROM vote_table WHERE post_id = 1234;

The first. column gives your average out of 5 and the count the total votes. To get all the stats at once:

SELECT AVG(vote), COUNT(vote), post_id FROM vote_table GROUP BY post_id;