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SELECT 
    PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY SUM(CASE WHEN PF.VoteTypeId = 2 THEN 1 ELSE 0 END)) OVER() AS MedianUpvotes30,
    PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY SUM(CASE WHEN PF.VoteTypeId = 3 THEN 1 ELSE 0 END)) OVER() AS MedianDownvotes30
FROM 
    Posts AS P
LEFT JOIN 
    PostFeedback AS PF ON P.Id = PF.PostId
WHERE 
    P.CreationDate BETWEEN '2022-06-20' AND '2022-10-19' 
    AND P.PostTypeId = 1
    AND DATEDIFF(minute, P.CreationDate, PF.CreationDate) <= 30;

fork query

edited may 3

created may 3 anonymous