CREATE TABLE ship (Ship_ID NUMBER, Name CLOB, Type CLOB, Nationality CLOB, Tonnage NUMBER)
CREATE TABLE mission (Mission_ID NUMBER, Ship_ID NUMBER, Code CLOB, Launched_Year NUMBER, Location CLOB, Speed_knots NUMBER, Fate CLOB)

What is the total number of ships with different nationalities and ship types?, sort in descending by the total number.
SELECT Nationality, COUNT(Nationality) FROM ship GROUP BY Type, Nationality ORDER BY COUNT(Nationality) DESC
SELECT "Nationality", COUNT("Nationality") FROM "ship" GROUP BY "Type", "Nationality" ORDER BY COUNT("Nationality") DESC