QA - Find interesting unanswered questions.sql

-- https://data.stackexchange.com/stackoverflow/query/4038/find-interesting-unanswered-questions
-- Find interesting unanswered questions
-- Looks at unanswered questions in your top 20 tags and sorts them by
-- a combined weight which takes into account: score, askers reputation and how
-- well you do on that particular tag
USE StackOverflow
go

DECLARE @UserId int = 4449743

create table #tags (TagId int, [Count] int)

insert #tags 
SELECT TOP 20 
    TagId,
    COUNT(*) AS UpVotes 
FROM Tags
    INNER JOIN PostTags ON PostTags.TagId = Tags.id
    INNER JOIN Posts ON Posts.ParentId = PostTags.PostId
    INNER JOIN Votes ON Votes.PostId = Posts.Id and VoteTypeId = 2
WHERE 
    Posts.OwnerUserId = @UserId
GROUP BY TagId
ORDER BY UpVotes DESC


create table #unanswered (Id int primary key)

insert #unanswered 
select q.Id  from Posts q
where (select count(*) from Posts a where a.ParentId = q.Id and a.Score > 0) = 0
and CommunityOwnedDate is null and ClosedDate is null and q.ParentId is null 
and AcceptedAnswerId is null


select top 2000 u.Id as [Post Link], 
(sum(t.[Count]) / 10.0 + us.Reputation / 200.0 + p.Score * 100) as Weight 
from #unanswered u
join Posts p on u.Id = p.Id
join PostTags pt on pt.PostId = u.Id
join #tags t on t.TagId = pt.TagId  
join Users us on us.Id = p.OwnerUserId  
group by u.Id, us.Reputation, p.Score 
order by Weight desc