What is the name of the 24 hour diner at San Francisco?
name refers to label; 24 hour diner refers to food_type = '24 hour diner'; San Francisco refers to city = 'san francisco'
SELECT label FROM generalinfo WHERE food_type = '24 hour diner' AND city = 'san francisco'
database name:db_id restaurant
geographic table geographic Cols: city dtype text, country dtype text, region dtype text, 
generalinfo table generalinfo Cols: id restaurant dtype integer, label dtype text, food type dtype text, city dtype text, review dtype real, 
location table location Cols: id restaurant dtype integer, street number dtype integer, street name dtype text, city dtype text, 
