CREATE TABLE table_40905 ("Block" CLOB, "Launched" FLOAT, "Operational" FLOAT, "Not usable" FLOAT, "Retired" FLOAT, "Launch Failures" FLOAT)

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_40905 WHERE "Launched" = '4' AND "Not usable" > '0'
SELECT SUM("Launch Failures") FROM "table_40905" WHERE "Launched" = '4' AND "Not usable" > '0'