What batting style corresponds to a bowling style of right arm medium for Stuart Williams?
CREATE TABLE "west_indies" (
  "player" text,
  "date_of_birth" text,
  "batting_style" text,
  "bowling_style" text,
  "first_class_team" text
);
SELECT "batting_style" FROM "west_indies" WHERE "bowling_style"='right arm medium' AND "player"='stuart williams';