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Q&A about the site for linguists, teachers and students of the Ukrainian language

;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 year(cre), month(cre), ROUND((COUNT(clo))*100.0/(COUNT(*)),2) AS percentage
FROM firstpostsclosed_cte
GROUP BY year(cre), month(cre)
ORDER BY year(cre), month(cre)

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edited jan 13 19

created jan 13 19 Martin20528