Show tags that have no wiki excerpt or no wiki body.
Q&A for professional and enthusiast programmers
SELECT 'site://tags/' + t.TagName + '|' + t.TagName AS [Tag], t.Count AS [Uses], e.Body AS [Excerpt], b.Body AS [Wiki] FROM Tags t LEFT JOIN Posts e ON e.Id = t.ExcerptPostId LEFT JOIN Posts b ON b.Id = t.WikiPostId WHERE (e.Body IS NULL OR b.Body IS NULL OR Len(e.Body) = 0 OR Len(b.Body) = 0) ORDER BY Count DESC