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A network database model handles relationships by allowing multiple parent and child record types, forming a complex network structure.
In a network database model, relationships are managed through a set of pointers that connect different data elements. This model is a flexible way of representing objects and their relationships. Unlike the hierarchical model, which allows only one parent for a child, the network model allows each child to have multiple parents, forming a complex network of relationships.
The network model represents data as records and relationships as sets. A set comprises of an owner record type, a set name, and a member record type. Each set defines a one-to-many relationship between the owner and the member. The owner record type can be a member or owner in any number of sets, and the member record type can be an owner or a member in any number of sets. This allows for complex relationships to be modelled and managed effectively.
The relationships in a network database model are physically implemented by using pointers. These pointers are essentially memory addresses that point from one record to another. For example, a record for a student might have a pointer to a record for the course that the student is enrolled in. This pointer-based approach allows for efficient traversal of relationships in the database.
However, managing these pointers can be complex. Adding, deleting, or updating records requires updating the relevant pointers, which can be a time-consuming process. Furthermore, the network model requires a database management system that can handle the complexity of the pointer structure.
In summary, the network database model handles relationships by allowing multiple parent and child record types, forming a complex network structure. This model uses pointers to physically implement these relationships, allowing for efficient traversal of the database. However, managing these pointers can be complex and requires a sophisticated database management system.
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