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-- result table, don't rename and keep the site column
create table #results (site nvarchar(250), id int, creationdate datetime, title nvarchar(250), score 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 + '''
     , p.id
     , p.creationdate
     , p.title
     , p.score
from ' + quotename(name) + '.dbo.posts as p
where p.tags LIKE ''%<' + ##tagName:string## + '>%'' collate sql_latin1_general_cp1_ci_ai
'
from sys.databases
where database_id > 5
-- and (name not like '%.Meta' or name = 'StackExchange.Meta')

--print @sql

-- execute it
exec (@sql)

-- Site details, cf. https://meta.stackexchange.com/a/359795/295232
CREATE TABLE #Sites (URL NVARCHAR(100), SiteName NVARCHAR(100), DatabaseName NVARCHAR(50));
-- fetch Markdown for post containing table with site details
DECLARE @md NVARCHAR(MAX);
SELECT TOP 1 @md = Text
  FROM [StackExchange.Meta].dbo.PostHistory
  WHERE PostId = 359796 AND PostHistoryTypeId = 5
  ORDER BY CreationDate DESC;
-- split Markdown on pipe symbol
CREATE TABLE #TableEntries (ID INT IDENTITY(1, 1), Value NVARCHAR(100));
INSERT INTO #TableEntries (Value)
SELECT LEFT(TRIM(VALUE), 100) FROM STRING_SPLIT(@md, '|')
  WHERE LEN(TRIM(REPLACE(REPLACE(VALUE, CHAR(10), ''), CHAR(13), ''))) > 0;
-- 'pivot' - we have to discard the introductory text, headers and horizontal lines
INSERT INTO #Sites
SELECT t0.Value, t1.Value, t2.Value
  FROM #TableEntries AS t0
  INNER JOIN #TableEntries AS t1
    ON t0.Id + 1 = t1.Id
  INNER JOIN #TableEntries AS t2
    ON t0.Id + 2 = t2.Id
  WHERE t0.Id >= 8 -- that's where the real content starts
    AND t0.Id % 3 = 2;
    
-- show results
select sitename, 
  url + '/q/' + cast(id as nvarchar) + '|' + title as 'question'
      -- rest of columns
      , creationdate
      , score
from #results AS r
INNER JOIN #Sites AS s
  ON r.Site = s.DatabaseName
order by creationdate desc

drop table #results

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