Help with this 2 please in mysql

Ships(name, class, launched) Classes(class, type, country, numGuns, bore, displacement) Battles(name, date) Outcomes(ship, battle, result)

3. Which battleships had guns with the second largest gun size. More precisely, find the ships whose gun size was exceeded by only one gun size, no matter how many other ships had that larger gun size. List the names of the ships and their gun size.

5. List all the pairs of countries that fought each other in battles. List each pair only once, and list them with the country that comes first in alphabetical order first.