What are the three paradigms of database

What are the three paradigms of database ？
First normal form ： Each column cannot be split in .
Second normal form ： On the basis of the first paradigm , Non primary key columns are completely dependent on progressive , Instead of relying on a part of the primary key .
Third normal form ： On the basis of the second paradigm , Non primary key columns only depend on the primary key , Not dependent on other non primary keys .
When designing the database structure , Try to follow the three paradigms , If not , There must be a good reason . Such as performance . In fact, we often compromise database design for performance .