Downvotes on questions versus answers

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-- http://blog.stackoverflow.com/2011/06/optimizing-for-pearls-not-sand/
declare @epoch datetime = '##epoch?2011-05-06##';

with sample_posts as (
select p.Id,
       v.CreationDate posted,
       1 Score,
       case
         when v.CreationDate < @epoch then
              case 
                when PostTypeId = 1 then 'ten_question' 
                when PostTypeId = 2 then 'ten_answer' 
              end
         when v.CreationDate > @epoch then
              case 
                when PostTypeId = 1 then 'five_question' 
                when PostTypeId = 2 then 'five_answer' 
              end
       end post_type
from PostsWithDeleted p
     join Votes v on p.Id = v.PostId
where PostTypeId in (1,2)
      and VoteTypeId = 3
)

select --count(*),
       dateadd(week, datediff(week, @epoch, posted), @epoch) week,
       sum(case when post_type = 'ten_question' then Score end)
     - sum(case when post_type like 'ten_answer' then Score end) ten_vote,
       sum(case when post_type = 'five_question' then Score end)
     - sum(case when post_type like 'five_answer' then Score end) five_vote
from sample_posts
group by datediff(week, @epoch, posted)
having count(*) > 50
order by datediff(week, @epoch, posted)

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