CREATE TABLE "player_win_loss_record" (
  "player" text,
  "total_win_loss" text,
  "singles_win_loss" text,
  "doubles_win_loss" text,
  "no_of_ties" real,
  "first_year_played" real,
  "years_played" real
);

Question: How many years did the team that has a Singles win-Loss of 4-9 and first played before 1999?
SQL: SELECT SUM("years_played") FROM "player_win_loss_record" WHERE "singles_win_loss"='4-9' AND "first_year_played"<1999;