What is Win %, when Conference Titles is 0, and when Win-Loss is 20-10?
CREATE TABLE "all_time_head_coaches" (
  "coach" text,
  "years" text,
  "win_loss" text,
  "win_pct" text,
  "conference_titles" text
);
SELECT "win_pct" FROM "all_time_head_coaches" WHERE "conference_titles"='0' AND "win_loss"='20-10';