Table: yuriko_kobayashi_2004_wjc
Columns: year
competition
venue
position
notes

Question: What is the earliest year the world junior championships has 1500 m notes?
SQL: SELECT MIN("year") FROM yuriko_kobayashi_2004_wjc WHERE "notes" = '1500 m' AND "competition" = 'world junior championships'

Question: Which venue had 5000 m notes in 2009 with a 1st position?
SQL: SELECT "venue" FROM yuriko_kobayashi_2004_wjc WHERE "notes" = '5000 m' AND "year" = 2009 AND "position" = '1st'

Question: What is the average year with 7th (heats) position?
SQL: SELECT AVG("year") FROM yuriko_kobayashi_2004_wjc WHERE "position" = '7th (heats)'