What is Date, when Rating 1.5, and when Event is Johnson Vs. Moraga?
CREATE TABLE "ufc_on_fox_s_nielsen_rating" (
  "event" text,
  "date" text,
  "rating" text,
  "share" text,
  "viewers" text
);
SELECT "date" FROM "ufc_on_fox_s_nielsen_rating" WHERE "rating"='1.5' AND "event"='johnson vs. moraga';