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Elaborate the difference between hierarchical database, network database, relational database, and object-oriented database with diagrams.

Question

Elaborate the difference between hierarchical database, network database, relational database, and object-oriented database with diagrams.

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Solution

Sure, let's discuss the differences between hierarchical database, network database, relational database, and object-oriented database.

  1. Hierarchical Database: In a hierarchical database, data is organized into a tree-like structure. It implies that, data is stored hierarchically (top-down or bottom-up) format. The data is represented using parent-child relationship. However, one parent can have multiple children but children have only one parent.

Diagram:

    Parent
    /    \
Child1  Child2
  1. Network Database: In a network database, data is organized more like a graph, and are allowed to have more than one parent node. This model allows each child to have multiple parents, which makes it a bit more complex to design and manage.

Diagram:

  Parent1     Parent2
     \         /
      Child
  1. Relational Database: In a relational database, data is organized into one or more tables. Each table has a unique key field which is used to connect it to other tables. Hence, all the tables are related to each other in some way. This model is most commonly used in the industry because it is easy to use and understand.

Diagram:

Table1 <----> Table2
  1. Object-oriented Database: In an object-oriented database, data is organized around objects rather than actions, and around data rather than logic. For instance, a multimedia record in a relational database can be a definable data object, as opposed to an alphanumeric value.

Diagram:

Object1 <----> Object2

Each of these database models have their own use-cases and are used in different scenarios depending on the requirements.

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