CREATE TABLE "table1_19744915_18" (
  "rank" real,
  "couple" text,
  "judges" real,
  "public" real,
  "total" real,
  "vote_percentage" text,
  "result" text
);

Question: When 9 is the rank who are the couple?
SQL: SELECT "couple" FROM "table1_19744915_18" WHERE "rank"=9;

Question: When roxanne and daniel are the couple what is the highest rank?
SQL: SELECT MAX("rank") FROM "table1_19744915_18" WHERE "couple"='Roxanne and Daniel';

Question: When ellery and frankie are the couple what is the highest total?
SQL: SELECT MAX("total") FROM "table1_19744915_18" WHERE "couple"='Ellery and Frankie';

Question: When 8 is the public what are the results?
SQL: SELECT "result" FROM "table1_19744915_18" WHERE "public"=8;

Question: When 8 is the public and the result is safe what is the highest rank?
SQL: SELECT MAX("rank") FROM "table1_19744915_18" WHERE "result"='Safe' AND "public"=8;