ER Diagram For Online Examination System – It is believed that the ER Diagram can be a great tool in data mining. This is due to the fact that it allows you to display complicated relationships in a straightforward format. The fundamental steps are identical regardless of the place you’re working. It starts by identifying “what” your system is. A rectangle is the symbol of the entity and needs to be provided with plenty of room. Then, you can insert ovals for attributes and link them to the entity. There should be a gap between your rectangle and an oval.
Each entity on an ER diagram is referred to as an attribute. It is the property or trait in an organization. In the case of an ER diagram the Inventory Item Name is an attribute of the entity Inventory Item. The entity can have as many attributes as it requires, and each attribute could have particular characteristics. For example, a customer’s address can have an address, street number or city. It could also have a state. These are composite attributes and there are no constraints regarding the number of each.
The next step in the process of analyzing the ER diagram would be to define the amount of information each entity is able to provide. The cardinality of an entity is the number of factors that exist among two different entities. For example, a customer could purchase several phones through the same cell phone service and the cell phone provider may have several phones under one bill. The ER diagram can make it easier to recognize the relationship between entities. It can also help you determine what information is the basis of each entity.
As the system develops and becomes more complex, an ER diagram could become crowded and difficult to understand. The complexity associated with the ER diagram requires more detailed representation on a micro-level. A properly designed ER diagram will allow you to get a better understanding of a system far more precise manner. Be sure to include white space in between tables in the ER diagram to keep from confusion. If you don’t do this, it could be difficult to determine the relationship between two different entities.
A person is an entity. An entity is a thing or a class. An entity can be a person as well as a town or even an organization. A weaker entity is one that relies on one another and does not possess the fundamental attributes. A characteristic is the property or characteristic of an object. The person in the ER diagram is an adjective. In the same way, the city has a status of an organization. Hence, a connection exists between two entities is a noun.
The characteristics included in an ER diagram should be labeled. As an example, a teacher entity can have multiple value for each subject. Student entities can have several subjects. The relationship between two people is illustrated by diamond-shaped shapes. These lines are typically described by verbs. They are then called entities. If a student has doubts on the meaning of an attribute or a term, the ER diagram will aid them in understanding the relation between two objects.
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