Using illustration differentiate between network database model and hierarchical database model ?

The network database model is represented by a series of interconnected records, where each record can have multiple parent and child records. This model allows for more complex relationships between data entities. In the illustration, the network database model is shown as a series of interconnected nodes, with lines connecting each node to its parent and child nodes.

On the other hand, the hierarchical database model is represented by a tree-like structure, where each record has only one parent record and can have multiple child records. This model is more rigid in terms of relationships between data entities. In the illustration, the hierarchical database model is shown as a tree structure, with each node having only one parent node and multiple child nodes.

Network Database Model

- Structure: A network database model represents data as a collection of nodes and edges. Nodes represent entities, while edges represent relationships between entities. The relationships between nodes can be one-to-one, one-to-many, or many-to-many.
- Example: A network database model could be used to represent a social network, where nodes represent users and edges represent friendships.

Hierarchical Database Model

- Structure: A hierarchical database model represents data as a tree structure. The tree is organized into levels, with the root node at the top and the leaf nodes at the bottom. Each node in the tree can have multiple child nodes, but only one parent node.
- Example: A hierarchical database model could be used to represent a file system, where the root node represents the root directory and the leaf nodes represent files.

Comparison

The following table compares the network database model and the hierarchical database model:

| Feature | Network Database Model | Hierarchical Database Model |
|---|---|---|
| Structure | Collection of nodes and edges | Tree structure |
| Relationships | One-to-one, one-to-many, many-to-many | One-to-many |
| Examples | Social networks, semantic networks | File systems, organizational charts |

Advantages of Network Database Model

- Flexibility: Network database models are very flexible, as they can represent any type of relationship between entities.
- Expressiveness: Network database models are very expressive, as they can represent complex data structures.

Disadvantages of Network Database Model

- Performance: Network database models can be slow to perform queries, especially for large datasets.
- Complexity: Network database models can be complex to design and implement.

Advantages of Hierarchical Database Model

- Simplicity: Hierarchical database models are simple to design and implement.
- Performance: Hierarchical database models are fast to perform queries, especially for small datasets.

Disadvantages of Hierarchical Database Model

- Rigidity: Hierarchical database models are not very flexible, as they can only represent one-to-many relationships.
- Limited expressiveness: Hierarchical database models are not very expressive, as they cannot represent complex data structures.