CREATE TABLE table_name_23 (tonnage_grt INT, type VARCHAR, nationality VARCHAR)

What is the total Tonnage GRT with a Type of cargo ship, and a Nationality of norway?
SELECT SUM(tonnage_grt) FROM table_name_23 WHERE type = "cargo ship" AND nationality = "norway"
SELECT SUM("tonnage_grt") FROM "table_name_23" WHERE "cargo ship" = "type" AND "nationality" = "norway"