SELECT DISTINCT T1.name FROM station AS T1 JOIN status AS T2 ON T1.id  =  T2.station_id WHERE T2.bikes_available  =  7
Return the unique name for stations that have ever had 7 bikes available.
CREATE TABLE station (
    id INTEGER PRIMARY KEY,
    name TEXT,
    lat NUMERIC,
    long NUMERIC,
    dock_count INTEGER,
    city TEXT,
    installation_date TEXT);
CREATE TABLE status (
    station_id INTEGER,
    bikes_available INTEGER,
    docks_available INTEGER,
    time TEXT,
    FOREIGN KEY (station_id) REFERENCES station(id)
);
CREATE TABLE trip (
    id INTEGER PRIMARY KEY,
    duration INTEGER,
    start_date TEXT,
    start_station_name TEXT, -- this should be removed
    start_station_id INTEGER,
    end_date TEXT,
    end_station_name TEXT, -- this should be removed
    end_station_id INTEGER,
    bike_id INTEGER,
    subscription_type TEXT,
    zip_code INTEGER);
CREATE TABLE weather (
    date TEXT,
    max_temperature_f INTEGER,
    mean_temperature_f INTEGER,
    min_temperature_f INTEGER,
    max_dew_point_f INTEGER,
    mean_dew_point_f INTEGER,
    min_dew_point_f INTEGER,
    max_humidity INTEGER,
    mean_humidity INTEGER,
    min_humidity INTEGER,
    max_sea_level_pressure_inches NUMERIC,
    mean_sea_level_pressure_inches NUMERIC,
    min_sea_level_pressure_inches NUMERIC,
    max_visibility_miles INTEGER,
    mean_visibility_miles INTEGER,
    min_visibility_miles INTEGER,
    max_wind_Speed_mph INTEGER,
    mean_wind_speed_mph INTEGER,
    max_gust_speed_mph INTEGER,
    precipitation_inches INTEGER,
    cloud_cover INTEGER,
    events TEXT,
    wind_dir_degrees INTEGER,
    zip_code INTEGER);
INSERT INTO "station" VALUES(2,'San Jose Diridon Caltrain Station',37.329732,-1.21901782000000011405e+02,27,'San Jose','8/6/2013');
INSERT INTO "status" VALUES(3,12,3,'2015-06-02 12:46:02');
INSERT INTO "trip" VALUES(900504,384,'8/21/2015 17:03','Howard at 2nd',63,'8/21/2015 17:10','San Francisco Caltrain 2 (330 Townsend)',69,454,'Subscriber',94041);
INSERT INTO "weather" VALUES('8/29/2013',74,68,61,61,58,56,93,75,57,30.07,30.02,29.97,10,10,10,23,11,28,0,4,'',286,94107);