A HANA calculation view in CDS (Core Data Services) is a special type of view that allows for advanced data calculations and aggregations in the HANA database. Calculation views are created using the CDS language and can be used to combine data from multiple tables or views, perform complex calculations and aggregations, and expose the results as a new virtual table.

To create a HANA calculation view in CDS, you need to define the view using the CDS syntax, which allows you to specify the source tables or views, define the calculations and aggregations to perform, and define the output fields.

HANA calculation views in CDS provide a powerful way to perform complex data calculations and aggregations directly in the database, improving performance and simplifying application development.