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;with firstpostids_cte as (
SELECT MIN(Id) AS MinId, OwnerUserId
FROM Posts
WHERE PostTypeId=1
GROUP BY OwnerUserId
)
, firstpostsclosed_cte as (
SELECT
p.Id, p.CreationDate AS cre, p.ClosedDate AS clo
FROM firstpostids_cte fp JOIN Posts p ON fp.MinId=p.Id
)

SELECT 
eomonth(cre), ROUND((COUNT(clo))*100.0/(COUNT(*)),2) AS percentage
FROM firstpostsclosed_cte
GROUP BY eomonth(cre)
ORDER BY eomonth(cre)

fork query

edited jun 15 19

created jun 15 19 Martin20528