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Select  Datediff(year, p.CreationDate, Current_Timestamp) as Age, 
convert(DECIMAL(10,2), sum(case when p.AcceptedAnswerId is NULL   then 1
                                       else 0
                                  end))as sumAccepted,
       convert(DECIMAL(10,2), sum(case when p.AcceptedAnswerId is NULL then 1
                                       else 0
                                  end)
               ) / count(p.Id) as PercentAccepted
From Posts p
Where p.PostTypeId = 1
Group by Datediff(year, p.CreationDate, Current_Timestamp)
Order by Datediff(year, p.CreationDate, Current_Timestamp) desc

fork query

edited nov 12

created nov 12 anonymous