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Advanced Database Systems

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Question 1: What are the three main types of data models? Answer: 1. The Hierarchical Model - The idea in hierarchical models is that all data is arranged in a hierarchical fashion (a.k.a. a parent ... –child relationship). 2. The Network Model – This model alleviated the first concern as in the network model, one was not restricted to having one parent per child, a many-to-many relationship or a many-to-one relationship was acceptable. 3. The Relational Model - we ignore the way data files are connected and arrange our data into simple two-dimensional, unordered tables, then we can develop a calculus for queries (questions posed to the database) and focus on the data as data, not as a physical realization of a logical model. [Show More]

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