CDS(CORE DATA services) views basics

1) What is CDS view?

 Core Data Services, or CDS, is a “semantically rich” Data Definition Language (or DDL) created by SAP.

2) How many types of CDS views?

HANA CDS: the database language that can be used to create tables, views, and structures on the HANA database itself. Views created in HANA can be consumed from the Net weaver AS using Native SQL.

ABAP CDS:

•  Available with SAP Net weaver 7.40 SP5, is a valuable tool to have when programming for HANA. 
• However, ABAP CDS can be used even if the underlying database is not a HANA database, as it is an open DDL that is supported by many traditional databases as well. 
• CDS view is defined for existing database tables and views and already defined CDS views in ABAP dictionary.

3) Where we need to create the CDS views?

• Unlike SE11 transaction, we need to create these CDS Views in Eclipse using the special ABAP development tools.