How many hours does the Yelp business No. "5734" open on Saturday?
how many hours = SUBTRACT(closing_time, opening_time); business No. refers to business_id; open on Saturday refers to day_of_week = 'Saturday';
SELECT T1.closing_time - T1.opening_time AS "hour" FROM Business_Hours AS T1 INNER JOIN Days AS T2 ON T1.day_id = T2.day_id WHERE T2.day_of_week LIKE 'Saturday' AND T1.business_id = 5734