 what's the years for rockets where position is guard / forward
CREATE TABLE "w" (
  "player" text,
  "no_s" text,
  "height_in_ft" text,
  "position" text,
  "years_for_rockets" text,
  "school_club_team_country" text
);
SELECT "years_for_rockets" FROM "w" WHERE "position"='Guard / Forward';