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Q&A for speakers of other languages learning English

with a as (
  select
     pa.Score,
     pq.CreationDate as question_date,
     pa.CreationDate as answer_date,
     DATEDIFF(day, pq.CreationDate, pa.CreationDate) daydiff
  from Posts pa
  join Posts pq on pa.ParentId = pq.Id
)

select daydiff, avg(1.00*Score) quality from a
where daydiff >=0 and daydiff < 50
group by daydiff
order by daydiff

fork query

edited nov 15 19

created oct 29 19 anonymous