How do I determine which test cases are in test cycle A but NOT in test cycle B?

[Owen Clark]

Hi folks - I am not sure this is even possible, but I am looking to determine which set of tests were in cycle A but removed from cycle B. Basically a "diff" on the 2 test cycles.

In my case, cycle A had 1488 tests and cycle B has 1467 tests but I have yet to find a way using ZQL to find which tests are in cycle A but not in B. Any ideas?