Question: what is the fundamental difference between hana cds and abap cds?
Answer: SAP HANA CDS views reside at the level of the HANA database. SAP ABAP CDS views support the development of ABAP applications and can be used with any database and an ABAP stack of 7.40 SP05 and upwards. SAP HANA CDS views support the development of HANA native applications and can be used only with a HANA database.