CREATE TABLE "repeaters" (
  "call_sign" text,
  "frequency_m_hz" real,
  "city_of_license" text,
  "erp_w" real,
  "class" text,
  "fcc_info" text
);

Question: What is the call sign for a class of A?
SQL: SELECT "call_sign" FROM "repeaters" WHERE "class"='a';

Question: What is the average frequency MHz for license of eastville, virginia?
SQL: SELECT AVG("frequency_m_hz") FROM "repeaters" WHERE "city_of_license"='eastville, virginia';

Question: What is the average ERP W when the call sign is whre?
SQL: SELECT AVG("erp_w") FROM "repeaters" WHERE "call_sign"='whre';