What is the percentage of restaurants in the Bay Area region that scored over 4 for the review rating?
scored over 4 refers to review > 4; percentage = divide(count(id_restaurant where region = 'bay area' and review > 4), count(id_restaurant where region = 'Bay Area')) * 100%
SELECT CAST(SUM(IIF(T2.review > 4, 1, 0)) AS REAL) * 100 / COUNT(T2.id_restaurant) FROM geographic AS T1 RIGHT JOIN generalinfo AS T2 ON T1.city = T2.city WHERE T1.region = 'bay area'