CREATE TABLE table_40906 ("Block" CLOB, "Launched" FLOAT, "Operational" FLOAT, "Not usable" FLOAT, "Retired" FLOAT, "Launch Failures" FLOAT)

What is the highest number of not usable satellites when there are more than 0 launch failures, less than 30 retired, and the block is I?
SELECT MAX("Not usable") FROM table_40906 WHERE "Launch Failures" > '0' AND "Retired" < '30' AND "Block" = 'block i'
SELECT MAX("Not usable") FROM "table_40906" WHERE "Block" = 'block i' AND "Launch Failures" > '0' AND "Retired" < '30'