CREATE TABLE table_204_100 (id DECIMAL, "date" TEXT, "name of ship" TEXT, "nationality" TEXT, "tonnage" DECIMAL, "fate" TEXT)

which ship has the top amount of tonnage ?
SELECT "name of ship" FROM table_204_100 ORDER BY "tonnage" DESC LIMIT 1
SELECT "name of ship" FROM "table_204_100" ORDER BY "tonnage" DESC NULLS LAST LIMIT 1