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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 for designers and users of artificial or invented languages, consciously developed instead of having developed naturally

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
  cast(Tags as varchar) as [Tags per question],
  cast(QuestionCount as varchar) as [Number of questions]
from Counts
union all
select
  '',
  ''
union all
select
  'Average',
  'Total questions'
union all
select
  '----------------------------',
  '----------------------------'
union all
select
  cast((cast(sum(Tags * QuestionCount) as decimal) / sum(QuestionCount)) as varchar),
  convert(varchar, cast(sum(QuestionCount) as money), 1)
from Counts

view current version

edited feb 14 12

created feb 14 12 robert.koritnik