Question: Which Year has a Venue of bydgoszcz, poland, and an Event of junior team?
SQL: SELECT AVG("Year") FROM "2-18428075-1" WHERE "Venue" = 'bydgoszcz, poland' AND "Event" = 'junior team';

Question: Which Venue has a Year smaller than 2009, and an Event of 3000 m, and a Competition of World Youth Championships?
SQL: SELECT "Venue" FROM "2-18428075-1" WHERE "Year" < 2009.0 AND "Event" = '3000 m' AND "Competition" = 'World Youth Championships';

Question: Which Year has a Competition of Commonwealth Youth Games?
SQL: SELECT AVG("Year") FROM "2-18428075-1" WHERE "Competition" = 'Commonwealth Youth Games';