Hello Feroz,
I have tested the query and it works and it returns expected data for me. I would suggest to execute the same query in other working environments and validate it.
Answering to your next question, BO CMS database is encrypted, therefore Query Builder is the only option to pull desired data. CI_SYSTEMOBJECTS is a virtual table, so you would not find it at DB side. For more information on Query Builder, please refer Manikandan's blog:
BusinessObjects Query builder - Basics
Good luck!
- Mahesh