How many stations have fox as the primary affiliation and have been owned since 1986?
CREATE TABLE "stations" (
  "city_of_license_market" text,
  "station" text,
  "channel_tv_dt" text,
  "owned_since" text,
  "primary_affiliation" text
);
SELECT COUNT("station") FROM "stations" WHERE "primary_affiliation"='Fox' AND "owned_since"='1986';