ER Diagram 예제 – It is believed that the ER Diagram can be a powerful tool in data mining. It allows users to see complex relationships in a simple format. The basics are the identical regardless of the place you’re working. In the beginning, it is to determine “what” your system is. A rectangle represents the entity and should be given ample space. Add ovals to the attributes and link them to the entity. In the end, leave a space between your rectangle and an oval.
Every element on an ER diagram is called an attribute. It is the characteristic or trait that an individual entity has. In the case in an ER diagram it is an Inventory Item Name is one of the attributes of the entity Inventory Item. The entity may possess any number of attributes it needs, and each attribute may possess distinct attributes. For instance, a customer’s address can have a street number or city. Or state. These are composite characteristics, and there are no constraints on the number of each.
The next step in the process of analyzing the ER diagram is to understand the amount of information that each entity has. The primary characteristic of every individual is the number of variables that exist within two separate entities. A customer, for instance, could buy several phones on the same service on one phone, and the cell phone provider may have multiple phones in one bill. The ER diagram will make it easier to recognize the links between the entities. In addition, it can assist in determining the type of data that connects each of the entities.
When the system is growing and becomes more complex the ER diagram can become more complicated and confusing to comprehend. The complexity is the reason why an ER diagram requires more detailed representation of the micro-level. A well-designed ER diagram can help you learn about a system in more comprehensive manner. Remember to add white space between the tables of your ER diagram to prevent confusion. If you don’t, it will be difficult to understand the relationship between two different entities.
An individual is an entity. An entity is an object or class. An entity could be a person one, a municipality, or an entity. An entity that is weaker is one that relies on anotherentity, but lacks the key attributes. A characteristic is the property that an item has. The person shown in the ER diagram is a noun. As well, the city itself constitutes an entire entity. The reason why a connection is established between two entities is a noun.
The attributes of the ER diagram should be labeled. For example, a school entity can have multiple values for a subject. Students may have many subjects. The relation between two entities is represented in the form of diamonds. The lines are usually labeled with verbs. Then, they are known as entities. If a student is unclear on the meaning of an attribute an attribute, the ER diagram will help them understand the relation between two different objects.
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