CREATE TABLE "foreign_players" (
  "country" text,
  "player_name" text,
  "period" text,
  "position" text,
  "matches" text,
  "goals" text
);

Question: Name the player name with matches of 51
SQL: SELECT "player_name" FROM "foreign_players" WHERE "matches"='51';

Question: Name the position for brazil 2008 with goals of 0 1
SQL: SELECT "position" FROM "foreign_players" WHERE "country"='brazil' AND "period"='2008' AND "goals"='0 1';

Question: Name the goals with matches of 21
SQL: SELECT "goals" FROM "foreign_players" WHERE "matches"='21';

Question: Name the period with matches of 0 0 of portugal
SQL: SELECT "period" FROM "foreign_players" WHERE "matches"='0 0' AND "country"='portugal';