CREATE TABLE table_30868 ("Pick #" FLOAT, "Player" TEXT, "Position" TEXT, "Nationality" TEXT, "NHL team" TEXT, "College/junior/club team" TEXT)

What pick number was the Boston Bruins selection for defence?
SELECT "Pick #" FROM table_30868 WHERE "Position" = 'Defence' AND "NHL team" = 'Boston Bruins'
SELECT "Pick #" FROM "table_30868" WHERE "NHL team" = 'Boston Bruins' AND "Position" = 'Defence'