what is the team when sacks is 0 and the season is earlier than 1998?
CREATE TABLE "statistics" (
  "season" real,
  "team" text,
  "league" text,
  "games" text,
  "total_tackles" text,
  "solo" text,
  "tfl" text,
  "sacks" text,
  "int" text
);
SELECT "team" FROM "statistics" WHERE "sacks"='0' AND "season"<1998;