What's the sum of asts for boston college with a rebs over 63?
CREATE TABLE "e" (
  "player" text,
  "pos" text,
  "from" real,
  "school_country" text,
  "rebs" real,
  "asts" real
);
SELECT SUM("asts") FROM "e" WHERE "school_country"='boston college' AND "rebs">63;