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Returns average number of tags per question on a site. Additionally it also returns tag count breakdown with question counts. Best viewed as "Text-only results"

Q&A about the site for academics and those enrolled in higher education

with Counts as (
  select
    len(Tags) - len(replace(Tags, '<', '')) as Tags,
    count(*) as QuestionCount
  from Posts
  where PostTypeId = 1
  group by len(Tags) - len(replace(Tags, '<', ''))
  )
  select sum(QuestionCount), cast(sum(Tags * QuestionCount) as decimal) / sum(QuestionCount)
from Counts

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edited feb 14 12

created feb 14 12 robert.koritnik