### Database Schema:
CREATE TABLE location (
	id_restaurant	INTEGER	NOT NULL	PRIMARY KEY,
	street_num	INTEGER	NULL,
	street_name	TEXT	NULL,
	city	TEXT	NULL,
	foreign key (city) references geographic (city),
	foreign key (id_restaurant) references generalinfo (id_restaurant)
);

CREATE TABLE geographic (
	city	TEXT	NOT NULL	PRIMARY KEY,
	county	TEXT	NULL,
	region	TEXT	NULL
);

CREATE TABLE generalinfo (
	id_restaurant	INTEGER	NOT NULL	PRIMARY KEY,
	label	TEXT	NULL,
	food_type	TEXT	NULL,
	city	TEXT	NULL,
	review	REAL	NULL,
	foreign key (city) references geographic (city)
);

### User's Query:
What type of food is served at the restaurant located at 3140, Alpine Road at San Mateo County?

### Extra Knowledge:
3140 Alpine Road at San Mateo County refers to street_num = 3140 AND street_name = 'alpine rd' AND County = 'san mateo county'; type of food refers to food_type
SELECT T2.food_type FROM location AS T1 INNER JOIN generalinfo AS T2 ON T1.id_restaurant = T2.id_restaurant INNER JOIN geographic AS T3 ON T2.city = T3.city WHERE T3.County = 'san mateo county' AND T1.street_name = 'alpine rd' AND T1.street_num = 3140