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

Question: Name the total number of frequency Mhz with class of d and call sign of k201bm and ERP W less than 74
SQL: SELECT COUNT("frequency_m_hz") FROM "external_links" WHERE "class"='d' AND "call_sign"='k201bm' AND "erp_w"<74;

Question: Name the least frequency Mhz with call sign of k202ag
SQL: SELECT MIN("frequency_m_hz") FROM "external_links" WHERE "call_sign"='k202ag';

Question: Name the class with call sign of k220cp
SQL: SELECT "class" FROM "external_links" WHERE "call_sign"='k220cp';