CREATE TABLE status (id VARCHAR(255), station_id VARCHAR(255), lat INTEGER, bikes_available INTEGER); CREATE TABLE station (id VARCHAR(255), station_id VARCHAR(255), lat INTEGER, bikes_available INTEGER)
What are the ids of stations that have latitude above 37.4 and never had bike availability below 7?
    
SQL: SELECT id FROM station WHERE lat > 37.4 EXCEPT SELECT station_id FROM status GROUP BY station_id HAVING MIN(bikes_available) < 7