CREATE TABLE table_30509 ("Pick" FLOAT, "Player" TEXT, "Position" TEXT, "Nationality" TEXT, "NHL team" TEXT, "College/junior/club team" TEXT)

who is the person that plays left wing and is from canada that plays on the st. louis blues
SELECT "Player" FROM table_30509 WHERE "Position" = 'Left Wing' AND "Nationality" = 'Canada' AND "NHL team" = 'St. Louis Blues'
SELECT "Player" FROM "table_30509" WHERE "NHL team" = 'St. Louis Blues' AND "Nationality" = 'Canada' AND "Position" = 'Left Wing'