CREATE TABLE weekly_weather (station_id NUMBER, day_of_week CLOB, high_temperature NUMBER, low_temperature NUMBER, precipitation FLOAT, wind_speed_mph NUMBER)
CREATE TABLE train (id NUMBER, train_number NUMBER, name CLOB, origin CLOB, destination CLOB, time CLOB, interval CLOB)
CREATE TABLE route (train_id NUMBER, station_id NUMBER)
CREATE TABLE station (id NUMBER, network_name CLOB, services CLOB, local_authority CLOB)

Visualize a bar chart for the number of trains for each station by the station network name
SELECT network_name, COUNT(*) FROM station AS t1 JOIN route AS t2 ON t1.id = t2.station_id GROUP BY t2.station_id
SELECT "network_name", COUNT(*) FROM "station" "t1" JOIN "route" "t2" ON "t1"."id" = "t2"."station_id" GROUP BY "t2"."station_id"