Untagged questions (without locks), networkwide

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-- result table, don't rename and keep the site column
create table #results (site nvarchar(250)
                       , tagcount int);

declare @sql nvarchar(max) = ''   -- holds build up sql string

-- build one biq union sql, for each db
select @sql = @sql 
+ iif( len(@sql) > 1 
     , 'union'
     , 'insert into #results'
) +
-- here goes the per site query, fully qualify the database objects
N'
select ''' + name + ''', count(*)
  from ' + quotename(name) + '.dbo.tags as t
  inner join ' + quotename(name) + '.dbo.posttags as pt on pt.tagid = t.id
  inner join ' + quotename(name) + '.dbo.posts as p on p.id = pt.postid
  outer apply (
    select top 1 posthistorytypeid from ' + quotename(name) + '.dbo.posthistory
      where postid = p.id and posthistorytypeid in (14, 15)
      order by creationdate desc
      ) oa(posthistorytypeid)
  where t.tagname = ''untagged''
    and (oa.posthistorytypeid is null or oa.posthistorytypeid = 15)
'
from sys.databases
where database_id > 5
-- and (name not like '%.Meta' or name = 'StackExchange.Meta')

-- execute it
exec (@sql)

select
  LOWER('https://' +
    IIF(PATINDEX('%.Mathoverflow%', site) > 0,
    IIF(PATINDEX('%.Meta', site) > 0, 'meta.mathoverflow.net', 'mathoverflow.net'),
      IIF(PATINDEX('%.Ubuntu%', site) > 0,
      IIF(PATINDEX('%.Meta', site) > 0, 'meta.askubuntu.com', 'askubuntu.com'),
        IIF(PATINDEX('StackExchange.%', site) > 0,
          CASE SUBSTRING(site, 15, 200)
          WHEN 'Audio' THEN 'video'
          WHEN 'Audio.Meta' THEN 'video.meta'
          WHEN 'Beer' THEN 'alcohol'
          WHEN 'Beer.Meta' THEN 'alcohol.meta'
          WHEN 'CogSci' THEN 'psychology'
          WHEN 'CogSci.Meta' THEN 'psychology.meta'
          WHEN 'Garage' THEN 'mechanics'
          WHEN 'Garage.Meta' THEN 'mechanics.meta'
          WHEN 'Health' THEN 'medicalsciences'
          WHEN 'Health.Meta' THEN 'medicalsciences.meta'
          WHEN 'Moderators' THEN 'communitybuilding'
          WHEN 'Moderators.Meta' THEN 'communitybuilding.meta'
          WHEN 'Photography' THEN 'photo'
          WHEN 'Photography.Meta' THEN 'photo.meta'
          WHEN 'Programmers' THEN 'softwareengineering'
          WHEN 'Programmers.Meta' THEN 'softwareengineering.meta'
          WHEN 'Vegetarian' THEN 'vegetarianism'
          WHEN 'Vegetarian.Meta' THEN 'vegetarianism.meta'
          WHEN 'Writers' THEN 'writing'
          WHEN 'Writers.Meta' THEN 'writing.meta'
          ELSE SUBSTRING(site, 15, 200)
          END + '.stackexchange.com',
          IIF(PATINDEX('StackOverflow.%', site) > 0,
            CASE SUBSTRING(site, 15, 200)
            WHEN 'Br' THEN 'pt'
            WHEN 'Br.Meta' THEN 'pt.meta'
            ELSE SUBSTRING(site, 15, 200)
            END + '.stackoverflow.com',
            IIF(PATINDEX('%.Meta', site) > 0,
              'meta.' + SUBSTRING(site, 0, PATINDEX('%.Meta', site)) + '.com',
              site + '.com'
            )
          )
        )
      )
      )) + '/tags/untagged|' + site,
  tagcount
  FROM #results
  WHERE tagcount > 0
  ORDER BY tagcount DESC, site

drop table #results

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