CREATE TABLE table_name_51 (position VARCHAR, nationality VARCHAR, nhl_team VARCHAR)

What position is the player that is from Canada and on the Boston Bruins
SELECT position FROM table_name_51 WHERE nationality = "canada" AND nhl_team = "boston bruins"
SELECT "position" FROM "table_name_51" WHERE "boston bruins" = "nhl_team" AND "canada" = "nationality"