Top tags by closed question ratio

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--Ganked http://data.stackexchange.com/serverfault/query/59684/top-tags-by-closed-question-ratio
SELECT TOP 700
TagName, COUNT(ClosedPost.Id) / CONVERT(FLOAT,COUNT(*)) AS ClosedRatio, COUNT(*) AS QuestionCount
FROM Tags
    INNER JOIN PostTags ON PostTags.TagId = Tags.Id
    INNER JOIN Posts ON PostTags.PostId = Posts.Id
    LEFT JOIN Posts ClosedPost ON Posts.Id = ClosedPost.Id AND ClosedPost.ClosedDate != ''
WHERE Posts.PostTypeId = 1
GROUP BY TagName
ORDER BY COUNT(ClosedPost.Id) / CONVERT(FLOAT,COUNT(*)) DESC

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