CREATE TABLE "quarterfinal_2" (
  "rank" real,
  "athlete" text,
  "country" text,
  "time" text,
  "notes" text
);

Question: Which athlete had a rank of 6 and notes of sc/d?
SQL: SELECT "athlete" FROM "quarterfinal_2" WHERE "notes"='sc/d' AND "rank"=6;

Question: Which country is the athlete latt shwe zin with notes of sc/d from?
SQL: SELECT "country" FROM "quarterfinal_2" WHERE "notes"='sc/d' AND "athlete"='latt shwe zin';