Key attribute: Among an array of attributes against a particular entity or weak entity, the most important attribute is called a key attribute and it is depicted using an underline in an ellipse.
Composite attribute: An attribute may contain its own attributes. For example, an address may be depended on road number, flat number, state, country, etc. These attributes of an original attribute are called composite attributes. Composite attributes are also depicted using ellipse.
Relationship: It explains the relationship between any two entities. The relationship is depicted using diamonds. There are three types of relationships found between any two entities – Binary relationship, Ternary relationship, and Recursive relationship.
Binary Relation Can Be:
One to one
One to many
Many to many
These are components of ERD.
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Ways To Create An ER Diagram
Creating a perfect ER Diagram requires full attention, and you must follow these steps to create an ER diagram. These are as follows:
- You are first needed to recognize an entity which is then portrayed with the aid of rectangles.
- Then you must clearly describe the relationship between any two entities. The appropriate line with geometric symbols and signs is used to define the relationships.
- Attributes and key attributes are additionally placed within indirect figures.
- Now the ER diagram can be completed with the help of showing the exact relationship within the diamond shapes.
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