Dear Friend,
Please let us know what kind of interview, you appearing for: you know that HANA is in -memory database and can be used as a native HANA or SAP Applicaion on HANA.
1. HANA Database
2. SAP ERP or S/4 HANA (Basis), such as installation configuration,migration , upgrade , or functional knowledge related to hana such as simplification ,
3. SAP BW on HANA which require modeling, CDS view , Dashboard kind of skill set
please let us know if you need more details on this