What is the score points in WC Kerrville, when rank was points of 8?
CREATE TABLE "qualification" (
  "shooter" text,
  "event" text,
  "rank_points" text,
  "score_points" text,
  "total" text
);
SELECT "score_points" FROM "qualification" WHERE "event"='wc kerrville' AND "rank_points"='8';