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Django models - Coggle Diagram

- - - - cannot store null value in a column
    - - value in any row of the column cannot be repeated
    - - field which can uniquely identify each row in a table
        
        Rejects row with duplicate data
    - - field which can uniquely identify each row in a another table
        
        Establishes a referential link between the data in two tables
        
        If a foreign key references another column of the same table, this reference type is called a self-reference
    - - helps to validate that the value stored in the column, meets a specific condition
    - - specifies a default value when no value is specified