What is the total number of yr plyf with a G 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 COUNT("yr_plyf") FROM "coaches" WHERE "g_plyf"<0;