CREATE TABLE table_name_81 (ship VARCHAR, country VARCHAR, builder VARCHAR)

What ship was built by Palmers Shipbuilding and Iron Company for the Royal Navy?
SELECT ship FROM table_name_81 WHERE country = "royal navy" AND builder = "palmers shipbuilding and iron company"
SELECT "ship" FROM "table_name_81" WHERE "builder" = "palmers shipbuilding and iron company" AND "country" = "royal navy"