What is the nationality of the player who was previously with the Detroit Pistons?
CREATE TABLE "selections" (
  "player" text,
  "pos" text,
  "nationality" text,
  "previous_team" text,
  "years_of_nba_experience_a" real,
  "career_with_the_franchise" text
);
SELECT "nationality" FROM "selections" WHERE "previous_team"='detroit pistons';