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

Question: Band of am, and a Frequency of 0 846 has what purpose?
SQL: SELECT "purpose" FROM "defunct_callsigns" WHERE "band"='am' AND "frequency"='0 846';

Question: Frequency of 100.1 has what on-air id?
SQL: SELECT "on_air_id" FROM "defunct_callsigns" WHERE "frequency"='100.1';

Question: Callsign of 6nan has what purpose?
SQL: SELECT "purpose" FROM "defunct_callsigns" WHERE "callsign"='6nan';

Question: Band of am, and a Callsign of 6wh has what purpose?
SQL: SELECT "purpose" FROM "defunct_callsigns" WHERE "band"='am' AND "callsign"='6wh';

Question: Frequency of 0 864 has what callsign?
SQL: SELECT "callsign" FROM "defunct_callsigns" WHERE "frequency"='0 864';