CREATE TABLE table_name_73 (launch_failures INT, launched VARCHAR, not_usable VARCHAR)

What is the total launch failures when there are 4 launches, and the not usable is greater than 0?
SELECT SUM(launch_failures) FROM table_name_73 WHERE launched = 4 AND not_usable > 0
SELECT SUM("launch_failures") FROM "table_name_73" WHERE "launched" = 4 AND "not_usable" > 0