What is the average event for the Open Championship Tournament, and a Top-5 less than 1?
CREATE TABLE "summary" (
  "tournament" text,
  "wins" real,
  "top_5" real,
  "top_10" real,
  "top_25" real,
  "events" real,
  "cuts_made" real
);
SELECT AVG("events") FROM "summary" WHERE "tournament"='the open championship' AND "top_5"<1;