você tem que ter
for each row
CREATE TRIGGER UpdateStats
AFTER INSERT ON Restaurant
FOR EACH ROW
UPDATE RestaurantStats SET TotalRestaurants = TotalRestaurants + 1 WHERE Cusine = NEW.cusine;
for each row
CREATE TRIGGER UpdateStats
AFTER INSERT ON Restaurant
FOR EACH ROW
UPDATE RestaurantStats SET TotalRestaurants = TotalRestaurants + 1 WHERE Cusine = NEW.cusine;