Question

I have a thread, and different users rating a movie in 3 different types.

Say i have thread 22, and different types=movie.quality, movie.story and movie.imdb

so the structure of the rating table looks like this:

| ID | thread_id | user_id | type             | value
| 12 | 22        | 2       | 'movie.imdb'     | 8.5
| 23 | 22        | 4       | 'movie.imdb'     | 7.5
| 42 | 22        | 5       | 'movie.story'    | 8.5
| 56 | 22        | 6       | 'movie.quality'  | 8.5
| 76 | 22        | 6       | 'movie.imdb'     | 7.53

as a result of my query, i want to get the average pro id and type, something like

array(thread_id=22 => array(
                      type=>movie.imdb =>  average=>8.2),
                      type=>movie.story => average=>8.8),
                      type=>movie.quality => average=>8.1))

How can i structure this query?

Answer 1

you can do group by thread_id,type and can take AVG of value

select thread_id,type, avg (value)
from rating
group by thread_id,type

now from the output of this query you can select based on the thread_id in your code to make/form the array .. or more precisely array or array ..