what's the primary payload(s) with launch date being july 8, 1994
CREATE TABLE "use" (
  "edo_flight" real,
  "shuttle" text,
  "mission" text,
  "launch_date" text,
  "duration" text,
  "primary_payload_s" text
);
SELECT "primary_payload_s" FROM "use" WHERE "launch_date"='July 8, 1994';