What school did P Jay Gehrke of the Kansas City Royals attend?
CREATE TABLE "supplemental_first_round_selections" (
  "pick" real,
  "player" text,
  "team" text,
  "position" text,
  "school" text
);
SELECT "school" FROM "supplemental_first_round_selections" WHERE "position"='p' AND "team"='kansas city royals' AND "player"='jay gehrke';