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

Question: Which area served has a Callsign of 5ddn?
SQL: SELECT "area_served" FROM "defunct_callsigns" WHERE "callsign"='5ddn';

Question: What is the purpose for Frequency of 102.3?
SQL: SELECT "purpose" FROM "defunct_callsigns" WHERE "frequency"='102.3';

Question: What is the current freq for Frequency of 104.7?
SQL: SELECT "freq_currently" FROM "defunct_callsigns" WHERE "frequency"='104.7';