#database-design

#database-design

Every table has an ID field that should be an auto-incremented integer value, with an index on the ID. Rarely should a multiple-field key be needed.

For first and last names, a length of around 30 characters is typically sufficient for most cases. Middle names can often be shorter, around 20 characters.

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.