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-- result table, don't rename and keep the site column
CREATE TABLE #Results (Site NVARCHAR(250), Id INT, DisplayName NVARCHAR(40));

DECLARE @sql NVARCHAR(MAX) = ''; -- holds built 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 + ''', Id, DisplayName
  FROM ' + quotename(name) + '.dbo.Users
  WHERE AccountId = ' + CAST(##AccountId:int## as nvarchar) + '
'
FROM sys.databases
WHERE database_id > 5
  AND (name NOT LIKE '%.Meta' OR name = 'StackExchange.Meta');

-- 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 +
  IIF(r.Id IS NULL, '/users/join', '/users/' + CAST(r.Id AS NVARCHAR)) + '|' +
  IIF(r.Id IS NULL, 'Join ' + SiteName, r.DisplayName)
  FROM #Sites AS s
  LEFT OUTER JOIN #Results AS r
    ON r.Site = s.DatabaseName
  WHERE DatabaseName NOT LIKE '%.Meta' OR DatabaseName = 'StackExchange.Meta'
  ORDER BY r.Id DESC;

fork query

edited jan 24 21

created feb 15 17 Glorfindel