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-- *BONUS* For the questions created in 2017, what was the average time (in seconds) between when the question was created and when the accepted answer was provided?
;with questions_answered as (
select 
  ID, 
  CreationDate, 
  AcceptedAnswerid
from 
  posts
where
  year(creationdate) = 2017 
  and Acceptedanswerid is not null
)

Select 
  qa.ID, 
  qa.CreationDate as 'Question_date', 
  qa.AcceptedAnswerid, 
  p.ID, 
  p.Creationdate as 'Answer_date'
from 
  posts p
inner join 
  questions_answered qa on qa.AcceptedAnswerid = p.id

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