CREATE TABLE stadium (ID INT, name TEXT, Capacity INT, City TEXT, Country TEXT, Opening_year INT)
CREATE TABLE swimmer (ID INT, name TEXT, Nationality TEXT, meter_100 FLOAT, meter_200 TEXT, meter_300 TEXT, meter_400 TEXT, meter_500 TEXT, meter_600 TEXT, meter_700 TEXT, Time TEXT)
CREATE TABLE event (ID INT, Name TEXT, Stadium_ID INT, Year TEXT)
CREATE TABLE record (ID INT, Result TEXT, Swimmer_ID INT, Event_ID INT)

Plot mean meter 100 by grouped by meter 200 as a bar graph, and list by the y axis in ascending.
SELECT meter_200, AVG(meter_100) FROM swimmer GROUP BY meter_200 ORDER BY AVG(meter_100)
SELECT "meter_200", AVG("meter_100") FROM "swimmer" GROUP BY "meter_200" ORDER BY AVG("meter_100") NULLS FIRST