What are attributes in ER diagram?

Attributes are included to include details of the various entities that are highlighted in a conceptual ER diagram. Attributes are characteristics of an entity, a many-to-many relationship, or a one-to-one relationship. Multivalued attributes are those that are can take on more than one value.

What are the different types of information represented in the ER diagram?

ER diagrams use symbols to represent three types of information: entities (or concepts), relationships, and attributes.

Can attributes have attributes ER diagram?

In ER model, entities have attributes which can be of various types like single-valued, multi-valued, composite, simple, stored, derived and complex. But relationships can also have attributes associated to them.

What is optional attribute in ER diagram?

Required and Optional Attributes: A required attribute is an attribute that must have a value, and it cannot be left empty. The two boldfaced attributes in the Crow’s Foot notation indicate that the data entry is required. An optional attribute is an attribute that does not require a value, it can be left empty.

What is ER diagram of bank management system?

ER diagram of Bank Management System. ER diagram is known as Entity-Relationship diagram. It is used to analyze to structure of the Database. It shows relationships between entities and their attributes. An ER model provides a means of communication.

What are the attributes of a bank entity?

Entities and their Attributes are : Bank Entity : Attributes of Bank Entity are Bank Name, Code and Address. Code is Primary Key for Bank Entity. Customer Entity : Attributes of Customer Entity are Customer_id, Name, Phone Number and Address.

Which is the best description of an ER diagram?

ER diagram is known as Entity-Relationship diagram. It is used to analyze to structure of the Database. It shows relationships between entities and their attributes. An ER model provides a means of communication. ER diagram of Bank has the following description : Bank have Customer.

Which is an example of an entity relationship diagram?

For example, employees can supervise other employees. Attributes, which are represented by ovals. A key attribute is the unique, distinguishing characteristic of the entity. For example, an employee’s social security number might be the employee’s key attribute. A multivalued attribute can have more than one value.

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