There are 2 types of calculation views possible in SAP HANA.
Graphical calculation view
Scripted calculation view
Graphical calculation views are created using the graphical editor. Scripted calculation views are created using SQL Editor. Graphical based calculation views offer better performance compared to SQL based calculation views. But in scenarios where graphical calculation views cannot implement business logic, we need to use scripted calculation view. Complex calculations which are not possible thru graphical approach, can be created using SQLScript.