Give the street number of a bar in Oakland with a 2.7 review.
street number refers to street_num; bar refers to food_type = 'bar'; Oakland refers to city = 'oakland'; 2.7 review refers to review = 2.7
SELECT T2.street_num FROM generalinfo AS T1 INNER JOIN location AS T2 ON T1.id_restaurant = T2.id_restaurant WHERE T1.review = 2.7 AND T2.city = 'oakland' AND T1.food_type = 'bar'
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, 
