The schema is as follows:

Restaurants

restaurant

rID, name, address, cuisine

reviewer

vID, name

rating

vID, rID, stars, ratingdate

Find the difference between the average rating of Indian restaurants and the average rating of Chinese restaurants. $($Make sure to calculate the average rating for each restaurant, then the average of those averages for Indian and Chinese restaurants. Don't just calculate the overall average rating for Indian and Chinese restaurants.$)$ Note: The difference can be negative.