Which Facility ID has a City of license of springfield, ma, and a ERP / Power W smaller than 230?
CREATE TABLE "stations" (
  "call_sign" text,
  "frequency" text,
  "city_of_license" text,
  "facility_id" real,
  "erp_power_w" real,
  "height_m_ft" text,
  "class" text
);
SELECT MAX("facility_id") FROM "stations" WHERE "city_of_license"='springfield, ma' AND "erp_power_w"<230;