What is the Digital PSIP for channels over 15 with callsign CFTU-DT?
CREATE TABLE "television_stations" (
  "call_sign" text,
  "broadcast_channel" real,
  "digital_psip" real,
  "cable_channel" real,
  "network" text
);
SELECT "digital_psip" FROM "television_stations" WHERE "broadcast_channel">15 AND "call_sign"='cftu-dt';