What is the maximum number of assists for players named Anastasia Kostaki?
CREATE TABLE "player_stats" (
  "player" text,
  "games_played" real,
  "rebounds" real,
  "assists" real,
  "steals" real,
  "blocks" real,
  "points" real
);
SELECT MAX("assists") FROM "player_stats" WHERE "player"='Anastasia Kostaki';