CREATE TABLE table_55403 ("Ship's name" CLOB, "Date entered service" CLOB, "Date withdrawn" CLOB, "Tonnage" FLOAT, "Type of Ship" CLOB)

what is the tonnage of the ship koningin juliana?
SELECT "Tonnage" FROM table_55403 WHERE "Ship's name" = 'koningin juliana'
SELECT "Tonnage" FROM "table_55403" WHERE "Ship's name" = 'koningin juliana'