What is on the at 8:00 on the same channel that has Costello on at 8:30?
CREATE TABLE "tuesday" (
  "7_00" text,
  "7_30" text,
  "8_00" text,
  "8_30" text,
  "9_00" text,
  "9_30" text,
  "10_00" text,
  "10_30" text
);
SELECT "8_00" FROM "tuesday" WHERE "8_30"='costello';