Table schema:
CREATE TABLE status (id VARCHAR, station_id VARCHAR, lat INTEGER, bikes_available INTEGER); CREATE TABLE station (id VARCHAR, station_id VARCHAR, lat INTEGER, bikes_available INTEGER)

Question: 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