CREATE TABLE "table1_160728_4" (
  "channel" real,
  "band" text,
  "video_frequency" text,
  "audio_frequency" text,
  "station" text,
  "network" text,
  "transmission" text,
  "format" text,
  "status" text
);

Question: How many networks are there that have a channel number 7?
SQL: SELECT COUNT("network") FROM "table1_160728_4" WHERE "channel"=7;

Question: What station on the network is tv3?
SQL: SELECT "network" FROM "table1_160728_4" WHERE "station"='TV3';