In which colleges is the NFL Team New York Giants and with the position defensive back?
CREATE TABLE "round_eleven" (
  "pick_num" real,
  "nfl_team" text,
  "player" text,
  "position" text,
  "college" text
);
SELECT "college" FROM "round_eleven" WHERE "nfl_team"='New York Giants' AND "position"='Defensive back';