For this step, you should draw an E-R Diagram for this dataset. To this goal, you...

For this step, you should draw an E-R Diagram for this dataset. To this goal, you should conduct the following steps:

1. Identify the entities and composite entities

2. Identify the entities’ attributes and primary key

3. Identify the relationships among the entities and between entities and composite entities

4. Specify the relationships' integrities

Expert Solution

Please provide the dataset so that the E-R diagram can be made with all the neccessary question , i am attaching as sample E-R diagram for reference,

Identify the entities. The first step in making an ERD is to identify all of the entities you will use. An entity is nothing more than a rectangle with a description of something that your system stores information about. This could be a customer, a manager, an invoice, a schedule, etc. Draw a rectangle for each entity you can think of on your page. Keep them spaced out a bit.
Identify relationships. Look at two entities, are they related? If so draw a solid line connecting the two entities.
Describe the relationship. How are the entities related? Draw an action diamond between the two entities on the line you just added. In the diamond write a brief description of how they are related.
Add attributes. Any key attributes of entities should be added using oval-shaped symbols.
Complete the diagram. Continue to connect the entities with lines, and adding diamonds to describe each relationship until all relationships have been described. Each of your entities may not have any relationships, some may have multiple relationships. That is okay.

Tips for Effective ER Diagrams

Make sure that each entity only appears once per diagram.
Name every entity, relationship, and attribute on your diagram.
Examine relationships between entities closely. Are they necessary? Are there any relationships missing? Eliminate any redundant relationships. Don't connect relationships to each other.
Use colors to highlight important portions of your diagram.

Entity Relationship Diagram Examples

Hospital Billing Entity Relationship Diagram

Banking Transaction Entity Relationship Diagram

orchestra answered 2 years ago

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