The design here means not only visual arrangements but how all backbone and logic works. We have seen page management and data management before. Here we are talking about how pages work with data and how we can design our typical workflow.
Here are two essential things expected. Formulas and queries.

Formulas – here, we use formulas for doing all types of calculations on a particular page. All formulas are expected in javascript language.
example z = x – y where x,y,z are elements.

Queries – here, we use queries for bringing data, updating previously saved data, inserting and saving new data.
In the query section, we used simple SQL queries