Early Database Models
Although use of these models is rapidly waning, I've provided a brief overview of each for historical purposes. In an overall sense, I believe it is useful for you to know what preceded the relational model so that you have a basic understanding of what led to its creation and evolution.
In the following overview I briefly describe how the data in each model is structured and accessed, how the relationship between a pair of tables is represented, and one or two of the advantages or disadvantages of each model.
Some of the terms you'll ...