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SELECT tagname1, dup/total dup, total from (
SELECT Tags.TagName as tagname1, COUNT(distinct PostTags.PostId) AS dup FROM PostTags
LEFT JOIN PostLinks on PostLinks.PostId = PostTags.PostId
JOIN Tags on PostTags.TagId = Tags.Id

WHERE LinkTypeId = 3
group by Tags.TagName
) dups
LEFT JOIN (

SELECT Tags.TagName AS tagname, COUNT(distinct PostTags.PostId) AS total FROM PostTags
LEFT JOIN PostLinks on PostLinks.PostId = PostTags.PostId
JOIN Tags on PostTags.TagId = Tags.Id
group by Tags.TagName
)tots
ON dups.tagname1 = tots.tagname
order by dup/total desc

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edited dec 3

created dec 3 jon.doe46463