What is the station type of DWZM-TV?
CREATE TABLE "ptv_stations_nationwide" (
  "branding" text,
  "callsign" text,
  "ch_num" text,
  "power_k_w" text,
  "station_type" text,
  "location_transmitter_site" text
);
SELECT "station_type" FROM "ptv_stations_nationwide" WHERE "callsign"='DWZM-TV';