ER Diagram Questions With AnswERs – It is believed that the ER Diagram can be a excellent tool for data mining. This is because it allows you to display complex relationships in a simple format. The basic steps are the identical wherever you work. The first step is identifying “what” your system is. A rectangle represents the entity and needs to be provided with plenty of room. After that, add ovals to represent attributes and connect them with the entity. In the end, leave a space between your rectangle and an oval.
Every entity in one ER diagram is known as an attribute. It is the property or trait or characteristic of an object. In the case of an ER diagram an inventory Item Name is an attribute for the entity inventory Item. The entity can have any number of attributes it requires. Each attribute can have particular characteristics. For example, a customer’s address can be identified by an address, street number or city. Or state. They are composite attributes and there are no constraints on the number of each.
The next step to analyze the ER diagram will be to identify the amount of information that each entity contains. The cardinality of an entity is the number of factors that exist within two separate entities. For instance, a consumer could buy several phones on one cell phone service, while the cell operator maintains multiple phones in one bill. The ER diagram will make it easier to determine the links between the entities. In addition, it can help you to determine what the data is that connects each of the entities.
As the system gets bigger and becomes more complicated The ER diagram can become more congested and difficult to comprehend. The complex nature that comes with an ER diagram demands more precise representation at the micro-level. A properly designed ER diagram will help you get a better understanding of a system greater depth. Remember to add white space between the tables of your ER diagram to keep from confusion. If you don’t, it’ll be difficult to discern the connection between two entities.
A person is an entity. An entity is an object or a class. An entity could be a person or a city or an organization. A weaker entity is one that is dependent to another and has none of the most important attributes. An attribute is a description of a characteristic in an object. The person shown in the ER diagram is an adjective. Similarly, the city constitutes an entire entity. So, the connection between an entity is a noun.
The characteristics included in an ER diagram should be identified. As an example, a teacher entity could have multiple values for a subject. A student can be a part of several subjects. The relation between two individuals is represented by diamond-shaped shapes. In general, these lines are identified by verbs. Then, they are identified as entities. If a pupil is confused about the meaning of an attribute an attribute, the ER diagram will help them understand the relation between two different objects.
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