Average tag count per question

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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"

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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
  Tags as [Number of tags on question],
  cast(QuestionCount as varchar) as [Number of questions]
from Counts
union all
select
  cast(sum(Tags * QuestionCount) as decimal) / sum(QuestionCount),
  sum(QuestionCount)
from Counts

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