Question: What is the highest Year, when Apparatus is "vault", and when Rank-Final is less than 9?
SQL: SELECT MAX("Year") FROM "2-18066166-1" WHERE "Apparatus" = 'vault' AND "Rank-Final" < 9.0;

Question: What is Year, when Competition Description is "U.S. Championships", when Rank-Final is less than 3, and when Apparatus is "All-Around"?
SQL: SELECT "Year" FROM "2-18066166-1" WHERE "Competition Description" = 'U.S. Championships' AND "Rank-Final" < 3.0 AND "Apparatus" = 'All-Around';

Question: What is Apparatus, when Rank-Final is greater than 6, and when Competition Description is "U.S. Championships"?
SQL: SELECT "Apparatus" FROM "2-18066166-1" WHERE "Rank-Final" > 6.0 AND "Competition Description" = 'U.S. Championships';