What is the earliest last year with a yr plyf less than 0?
CREATE TABLE "coaches" (
  "coach" text,
  "first_yr" real,
  "last_yr" real,
  "w_lpct" real,
  "g_500" real,
  "yr_plyf" real,
  "g_plyf" real,
  "w_plyf" real,
  "l_plyf" real
);
SELECT MIN("last_yr") FROM "coaches" WHERE "yr_plyf"<0;