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SELECT TOP 10 
    Users.Id, 
    Users.DisplayName, 
    PostCounts.PostCount + CommentCounts.CommentCount AS PostsAndComments
FROM Users
LEFT JOIN (
    SELECT OwnerUserId, COUNT(*) AS PostCount
    FROM Posts
    WHERE CreationDate >= DATEADD(YEAR, -5, GETDATE())
    GROUP BY OwnerUserId
) AS PostCounts ON Users.Id = PostCounts.OwnerUserId
LEFT JOIN (
    SELECT UserId, COUNT(*) AS CommentCount
    FROM Comments
    WHERE CreationDate >= DATEADD(YEAR, -5, GETDATE())
    GROUP BY UserId
) AS CommentCounts ON Users.Id = CommentCounts.UserId
ORDER BY PostsAndComments DESC;

fork query

edited nov 2

created nov 1 jon.doe46164