Data Models And Its Type
Database Models And Its Type
A database model shows the logical structure of a database, including the relationships and constraints that determine how data can be stored and accessed.
Types of Database Models:
1.Hierarchical Model:
The hierarchical model organizes data into a tree-like structure, where each record has a single parent or root. Sibling records are sorted in a particular order. That order is used as the physical order for storing the database. This model is good for describing many real-world relationships.
2.Network Model:
If a child in a data relationship has more than one parent,the relationship cannot be described as a tree or hierarchical structure.Instead it is described as a network or plex structure.
Any item in a plex structure can be linked to any other item.In a plex structure, child can have more than one parent.
A relationship describes how two or more entities are related to each other. It is represented by__________ shape. | |||
| Right Option : A | |||
| View Explanation | |||
An E - R diagram is a graphic method of presenting _______________________ | |||
| Right Option : C | |||
| View Explanation | |||
In E - R diagram, relationship type is represented by ________________ | |||
| Right Option : D | |||
| View Explanation | |||
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