CREATE TABLE "defunct_callsigns" (
  "callsign" text,
  "area_served" text,
  "frequency" text,
  "band" text,
  "freq_currently" text,
  "purpose" text
);

Question: What is the frequency for katherine?
SQL: SELECT "frequency" FROM "defunct_callsigns" WHERE "area_served"='katherine';

Question: Which band has a current freq of 8tab (hpon)?
SQL: SELECT "band" FROM "defunct_callsigns" WHERE "freq_currently"='8tab (hpon)';

Question: Which freq currently has 0 657?
SQL: SELECT "freq_currently" FROM "defunct_callsigns" WHERE "frequency"='0 657';

Question: What is the purpose for the katherine freq of 8rn?
SQL: SELECT "purpose" FROM "defunct_callsigns" WHERE "freq_currently"='8rn' AND "area_served"='katherine';

Question: Which freq currently has 0 684?
SQL: SELECT "freq_currently" FROM "defunct_callsigns" WHERE "frequency"='0 684';

Question: Which band serves darwin for commercial purpose?
SQL: SELECT "band" FROM "defunct_callsigns" WHERE "area_served"='darwin' AND "purpose"='commercial';