What are the highest mbit/s when the dbm is +17.5?
CREATE TABLE "profiles" (
  "profile" text,
  "bandwidth_m_hz" text,
  "number_of_carriers" real,
  "carrier_bandwidth_k_hz" text,
  "power_d_bm" text,
  "max_downstream_throughput_mbit_s" real
);
SELECT "max_downstream_throughput_mbit_s" FROM "profiles" WHERE "power_d_bm"='+17.5';