Which Position has Throws of r, and a DOB of 12 february 1983?
CREATE TABLE "player_roster" (
  "surname" text,
  "first" text,
  "d_o_b" text,
  "bats" text,
  "throws" text,
  "position" text
);
SELECT "position" FROM "player_roster" WHERE "throws"='r' AND "d_o_b"='12 february 1983';