The JSON data comprises a list of locations in a county-town format, and car specifications including make, model, transmission types, fuel types, colors, and retail prices.
Polymorphic associations allow for a single table to represent related data from multiple sources, optimizing code and preventing redundancy by uniting similar functionalities under a single entity.
With virtual generated columns, we avoid using additional disk storage. Instead, the database calculates their value on demand, for example, during a query. However, PostgreSQL currently lacks support for the virtual generated columns.