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WITH TotalPosts AS (
    SELECT COUNT(*) AS TotalPostCount
    FROM Posts
),
PostsWithComments AS (
    SELECT COUNT(DISTINCT PostId) AS PostsWithCommentCount
    FROM Comments
    WHERE PostId IS NOT NULL
)
SELECT 
    (TotalPosts.TotalPostCount - PostsWithComments.PostsWithCommentCount) * 100.0 / TotalPosts.TotalPostCount AS PercentageNoComments
FROM TotalPosts, PostsWithComments;

fork query

created nov 2 anonymous