Name the college that has 7 rounds and boston celtics team
CREATE TABLE "other_picks" (
  "round" text,
  "pick" text,
  "player" text,
  "position" text,
  "nationality" text,
  "team" text,
  "college" text
);
SELECT "college" FROM "other_picks" WHERE "team"='boston celtics' AND "round"='7';