Finds tags that are missing a tag wiki (regardless of tag excerpt).
Q&A for programmers
SELECT Count, ('site://tags/' + TagName + '|' + TagName) AS TagName, ExcerptPostId AS [Post Link], WikiPostId AS [Post Link] FROM Tags t LEFT JOIN Posts p ON p.Id = t.WikiPostId WHERE WikiPostId IS NULL -- no wiki post OR LEN(Body) = 0 -- wiki empty ORDER BY Count DESC
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