Cross-posts from Stack Overflow to Code Review

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/**
 * The objective of this query is to gather data related to cross-posts from
 *   Stack Overflow (SO) to Code Review (CR). A cross-post as defined in this context is
 *   a question which has first been asked on SO and then a short time later asked
 *   again on CR (albeit often slightly modified in the way it is titled or phrased).
 * Querying from 2 or more sites requires cross-database queries, and the following
 *   2 databases are used here. All relevant tables are in the [dbo] schema.
 * - Stack Overflow DB: [StackOverflow]
 * - Code Review DB:    [StackExchange.Codereview]
 * 2 temporary tables are used in order to compensate for the physsical limitations
 *   of SEDE which otherwise will often time out before the query is completed.
 * param @minutesFromSoPostToCrPost int not null : The number of minutes allowed between the original
 *   SO question and its cross-post on CR. Default 120 minutes.
 * param @maximumCharacterCountDifferenceAllowed int not null : The maximum number
 *   of characters difference between the body of the question.
 *   NOTE: The higher the number, the more likely that it's not actually a cross-post.
 */
if object_id('tempdb..#LanguageTags') is not null
    drop table #LanguageTags;
if object_id('tempdb..#CrossPosts') is not null
    drop table #CrossPosts;
go
create table #LanguageTags (
    TagName varchar(35) collate SQL_Latin1_General_CP1_CS_AS
    , constraint pk_#LanguageTags primary key (TagName)
);
go
insert into #LanguageTags (TagName)
values
  ('applescript'),
  ('asp.net-mvc-3'),
  ('bash'),
  ('brainfuck'),
  ('c'),
  ('c#'),
  ('c++'),
  ('c++11'),
  ('c++14'),
  ('cellular-automata'),
  ('cfml'),
  ('coffeescript'),
  ('css3'),
  ('cython'),
  ('dsl'),
  ('elixir'),
  ('hy'),
  ('jade'),
  ('java'),
  ('javascript'),
  ('jsx'),
  ('julia'),
  ('less-css'),
  ('lisp'),
  ('logo'),
  ('lolcode'),
  ('lua'),
  ('matlab'),
  ('maya'),
  ('objective-c'),
  ('ocaml'),
  ('php'),
  ('php5'),
  ('powershell'),
  ('python'),
  ('r'),
  ('rebol'),
  ('ruby'),
  ('rust'),
  ('scala'),
  ('scheme'),
  ('sql'),
  ('swift'),
  ('vba'),
  ('wolfram-mathematica'),
  ('xslt');
go
declare @questionPost int = 1;
declare @minutesFromSoPostToCrPost int = 120;
declare @maximumCharacterCountDifferenceAllowed int = 1000;

select
    [Primary Stack] = case
        when SoUsers.Reputation >= CrUsers.Reputation then 
            'Stack Overflow'
        else 
            'Code Review' 
        end
  , [Primary User] = case
        when SoUsers.Reputation >= CrUsers.Reputation then
            'http://stackoverflow.com/users/' + convert(varchar(10), SoUsers.Id) + '|' + SoUsers.DisplayName
        else 
            'http://codereview.stackexchange.com/users/' + convert(varchar(10), CrUsers.Id) + '|' + CrUsers.DisplayName 
        end
        , [SO Original] = 'http://stackoverflow.com/questions/' + convert(varchar(10), SoPosts.Id) + '|' + SoPosts.Title
        , [CR Xpost] = 'http://codereview.stackexchange.com/questions/' + convert(varchar(10), CrPosts.Id) + '|' + CrPosts.Title
  /*Calculate the character difference of the body of both questions.*/
  , [CharCountDiff] = abs(len(CrPosts.Body) - len(SoPosts.Body))
  , [SO Score] = SoPosts.Score
  , [CR Score] = CrPosts.Score
  , [SO Status] = case
        when SoPosts.DeletionDate is not null then 'Deleted'
        when SoPosts.ClosedDate is not null then 'Closed'
        else 'OK' end
  , [CR Status] = case
        when CrPosts.DeletionDate is not null then 'Deleted'
        when CrPosts.ClosedDate is not null then 'Closed'
        else 'OK' end
  /*Check in @Duga comments*/
  , [DugaComments?] = case
        when exists (
            select 1 from [StackOverflow].dbo.Comments as SoComments
            where SoPosts.Id = SoComments.PostId
            and SoComments.Text like '%code%review%'
        ) then 'True' end
  , [SO Answers] = SoPosts.AnswerCount
  , [CR Answers] = CrPosts.AnswerCount
  , [SO Accept?] = case 
        when SoPosts.AcceptedAnswerId is not null then 'True' end
  , [CR Accept?] = case 
        when CrPosts.AcceptedAnswerId is not null then 'True' end
  , [SO Created] = SoPosts.CreationDate
  , [Minutes to Xpost] = datediff(minute, SoPosts.CreationDate, CrPosts.CreationDate)
  , [Tags] = CrPosts.Tags

/*Adding results into temp table to avoid timeouts in `select distinct`*/
into #CrossPosts
from
    /*Common users across CR and SO sites:*/
    [StackExchange.Codereview].dbo.Users as CrUsers
    inner join [StackOverflow].dbo.Users as SoUsers
        /*AccountId is network-wide Id for each user, and
          is distinct from the UserId which is for a specific site*/
        on  CrUsers.AccountId = SoUsers.AccountId
        
    /*Questions by user on both sites:*/
    inner join [StackExchange.Codereview].dbo.Posts as CrPosts
        on  CrUsers.Id = CrPosts.OwnerUserId
        and CrPosts.PostTypeId = @questionPost
    inner join [StackOverflow].dbo.Posts as SoPosts
        on  SoUsers.Id = SoPosts.OwnerUserId
        and SoPosts.PostTypeId = @questionPost
        
    /*Bring in tags so we can try to eliminate false matches
      due to unrelated posts potentially being posted by the same
      user on 2 different sites within our scoped time period.*/
    inner join [StackExchange.Codereview].dbo.PostTags as CrPT
        on CrPosts.Id = CrPT.PostId
    inner join [StackExchange.Codereview].dbo.Tags as CrTags
        on CrPT.TagId = CrTags.Id
    inner join [StackOverflow].dbo.PostTags as SoPT
        on SoPosts.Id = SoPT.PostId
    inner join [StackOverflow].dbo.Tags as SoTags
        on  SoPT.TagId = SoTags.Id

where 
    /*Q was first posted on SO, then later on CR*/
    SoPosts.CreationDate < CrPosts.CreationDate
    
    /*Q was posted on CR within a certain number of minutes after being posted on SO*/
    and datediff(minute, SoPosts.CreationDate, CrPosts.CreationDate) <= @minutesFromSoPostToCrPost
    
    /*Match at least one language tag from CR->SO per post
      Note: We use `select distinct` on the query against #CrossPosts
        due to SEDE timing out if attempting to do it during this query.*/
    and CrTags.TagName = SoTags.TagName
    and exists (
        select 1 from #LanguageTags as Langs
        where CrTags.TagName = Langs.TagName
    )
    
    /*Apply filter based on character count difference of the body of both questions.*/
    and abs(len(CrPosts.Body) - len(SoPosts.Body)) <= @maximumCharacterCountDifferenceAllowed
;
/*Use this query to view full result set, or modify it 
  according to your needs to aggregate from the #CrossPosts table.*/
select distinct *
from #CrossPosts
order by [SO Created] desc;

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