human
Schema:
routes (rid, dst_apid, dst_ap, src_apid, src_ap, alid, airline, codeshare)
airports (apid, name, city, country, x, y, elevation, iata, icao)
airlines (alid, name, iata, icao, callsign, country, active)
Please answer with SQL.
assistant
Sure, I understand.
human
how many routes are there?
assistant
SELECT COUNT( * ) FROM routes;
human
what are their source airports? List airport names.
assistant
SELECT T1.name FROM airports AS T1 JOIN routes AS T2 ON T1.apid = T2.src_apid;
human
For each of those airports, how many routes does it have?
assistant
SELECT COUNT( * ) , T1.name FROM airports AS T1 JOIN routes AS T2 ON T1.apid = T2.src_apid GROUP BY T1.name;
human
order the result by decreasing number of routes
assistant
SELECT COUNT( * ) , T1.name FROM airports AS T1 JOIN routes AS T2 ON T1.apid = T2.src_apid GROUP BY T1.name ORDER BY COUNT( * ) DESC ;