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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 serious players and enthusiasts of chess

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],
  replace(convert(varchar, cast(QuestionCount as money), 1), '.00', '') as [Number of questions]
from Counts
union all
select
  'Avg = ' + cast((cast(sum(Tags * QuestionCount) as decimal) / sum(QuestionCount)) as varchar),
  'All = ' + replace(convert(varchar, cast(sum(QuestionCount) as money), 1), '.00', '')
from Counts

fork query

edited feb 14 12

created feb 14 12 robert.koritnik