Question: What is the total launch failures when there are 4 launches, and the not usable is greater than 0?
SQL: SELECT SUM("Launch Failures") FROM "2-16103661-2" WHERE "Launched" = 4.0 AND "Not usable" > 0.0;

Question: 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?
SQL: SELECT MAX("Not usable") FROM "2-16103661-2" WHERE "Launch Failures" > 0.0 AND "Retired" < 30.0 AND "Block" = 'Block I';

Question: What is the average number of not usable satellited when there are 0 retired, and the launch failures are less than 1?
SQL: SELECT AVG("Not usable") FROM "2-16103661-2" WHERE "Retired" = 0.0 AND "Launch Failures" < 1.0;