What is Jockey, when Horse is "Eight Belles"?
CREATE TABLE "post_positions" (
  "finished" real,
  "time_behind" text,
  "post" real,
  "horse" text,
  "jockey" text,
  "trainer" text,
  "owner" text
);
SELECT "jockey" FROM "post_positions" WHERE "horse"='eight belles';