Which Position has a DOB of 13 may 1987?
CREATE TABLE "player_roster" (
  "surname" text,
  "first" text,
  "d_o_b" text,
  "bats" text,
  "throws" text,
  "position" text
);
SELECT "position" FROM "player_roster" WHERE "d_o_b"='13 may 1987';