What is the smallest ERP W with a frequency MHz of 94.9?
CREATE TABLE "broadcast_translators_of_kanz" (
  "call_sign" text,
  "frequency_m_hz" real,
  "city_of_license" text,
  "erp_w" real,
  "class" text,
  "fcc_info" text
);
SELECT MIN("erp_w") FROM "broadcast_translators_of_kanz" WHERE "frequency_m_hz"=94.9;