Question: Which Year is the highest one that has a Venue of edmonton, canada?
SQL: SELECT MAX("Year") FROM "2-15307428-1" WHERE "Venue" = 'edmonton, canada';

Question: Which Position has a Competition of World Championships, and a Year larger than 1997?
SQL: SELECT "Position" FROM "2-15307428-1" WHERE "Competition" = 'World Championships' AND "Year" > 1997.0;

Question: Which Venue has a Notes of Heptathlon, and a Year of 1991?
SQL: SELECT "Venue" FROM "2-15307428-1" WHERE "Notes" = 'Heptathlon' AND "Year" = 1991.0;