What's the category in 1998 with the role/episode of David Duchovny?
CREATE TABLE "satellite_awards" (
  "year" real,
  "category" text,
  "recipients_and_nominees" text,
  "role_episode" text,
  "result" text
);
SELECT "category" FROM "satellite_awards" WHERE "year"=1998 AND "role_episode"='david duchovny';