Questions with the most views (top 1 per site)

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-- Temporary table to store the results
CREATE TABLE #results (
  site NVARCHAR(250),
  questionid INT,
  title NVARCHAR(250),
  viewcount INT
);

-- We'll need (at least) one INSERT statement for each site, they'll end up in this variable
DECLARE @sql NVARCHAR(MAX) = '';

-- Generate INSERT statements:
-- - Use the database's `name` to indicate the site (this can be converted to site name later on)
-- - Fully qualify table names
SELECT @sql = @sql + 'INSERT INTO #results' + N'
SELECT TOP 1 ''' + name + ''', p.Id, p.Title, p.ViewCount
  FROM ' + QUOTENAME(name) + '.dbo.Posts AS p
  ORDER BY ViewCount DESC;'
FROM sys.databases
WHERE database_id > 5 -- that's where the site databases begin
  AND name NOT LIKE '%.Meta'
  AND name NOT LIKE '%_Temp'; -- these are used during the weekly SEDE refresh

-- Execute SQL with INSERT statements
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;

-- Present the results by joining them with the sites table
SELECT SiteName AS 'site',
  CONCAT(URL, '/q/', questionid, '|', title) AS 'link',
  viewcount
  FROM #Results AS r
  INNER JOIN #Sites AS s
    ON r.Site = s.DatabaseName
  ORDER BY viewcount;
     
-- Drop temporary tables
DROP TABLE #results;
DROP TABLE #sites;

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