Database: public_review_platform
Question: Among all the users with the average ratings of at least 4 and above of all reviews, calculate the percent that have no fans or followers.
SQL: SELECT CAST(SUM(CASE WHEN user_fans = 'None' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(user_id) FROM Users WHERE user_average_stars >= 4