what is on a 8:30 when at 9:00 it is one tree hill (reruns)?
CREATE TABLE "monday" (
  "8_00" text,
  "8_30" text,
  "9_00" text,
  "9_30" text,
  "10_00" text
);
SELECT "8_30" FROM "monday" WHERE "9_00"='one tree hill (reruns)';