Question

I’d like to sum the total up and down votes on only the items bought by a single user. I have a big table so I don’t want to sum all votes made by everyone for EVERY item, just the items that a particular user bought.

Here’s my query so far:

select SUM(purchaseyesno) AS tots, SUM(rating=1) AS yes, SUM(rating=0) AS no, item_id
from items_purchased
where purchaser_account_id=12373 
group by item_id

as you can expect, these sums are only the summing user 12373’s info, so its just one value. I’m not sure how to get ALL the purchases of item_ids that are bought by user 12373.

I’m sure there is some kind of subquery,nesting thing I need to include but I’m clueless.

here’s how I’d like my data to look, item_id=3,4,5 are all bought by user=12373. Whereas item_id=1,2,6 were bought by other users.

item_id    tots    yes    no
   3        7       4      2
   4        5       1      3
   5        1       0      1

thoughts?

Answer 1

select item_id, SUM(purchaseyesno) tots, SUM(rating = 1) yes, SUM(rating = 0) no
from items_purchased
where item_id in (
    select item_id from items_purchased
    where purchaser_account_id = 12373
)
group by item_id