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Q&A for experienced flyers, pilots, and builders of drones and model aircraft

SELECT 
    FORMAT(p.CreationDate, 'yy-MM') as [Month],
    SUM(CASE WHEN t.TagName = 'php' THEN 1 ELSE 0 END) as PHPQuestions,
    SUM(CASE WHEN t.TagName = 'swift' THEN 1 ELSE 0 END) as SwiftQuestions,
    SUM(CASE WHEN t.TagName = 'ruby' THEN 1 ELSE 0 END) as RubyQuestions
FROM Posts p
INNER JOIN PostTags pt ON pt.PostId = p.Id
INNER JOIN Tags t ON t.Id = pt.TagId
WHERE 
    p.PostTypeId = 1  -- 1=Question
    AND t.TagName IN ('php', 'swift', 'ruby')
GROUP BY 
    FORMAT(p.CreationDate, 'yy-MM')
ORDER BY 
    [Month];

fork query

edited feb 28

created feb 28 anonymous