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-- result table, don't rename and keep the site column
CREATE TABLE #results (site nvarchar(250),
                       total int,
                       first datetime,
                       last datetime);

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 ALL'
     , 'INSERT INTO #results'
) +
-- here goes the per site query, fully qualify the database objects
N'
SELECT ''' + name + ''', COUNT(DISTINCT(PostId)), MIN(CreationDate), MAX(CreationDate)
  FROM ' + quotename(name) + '.dbo.PostHistory
  WHERE PostHistoryTypeId = 53 -- Removed from HNQ list
'
FROM sys.databases
WHERE database_id > 5
  AND name NOT LIKE 'StackExchange.Arabic%'
  AND name NOT LIKE '%.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 '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'
            )
          )
        )
      )
      )) + '|' + site,
  total, first, last
  FROM #results
  ORDER BY total DESC
     
DROP TABLE #results

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