What is EER diagram in DBMS?

What is EER diagram in DBMS?

An Entity–relationship model (ER model) describes the structure of a database with the help of a diagram, which is known as Entity Relationship Diagram (ER Diagram). An ER diagram shows the relationship among entity sets. An entity set is a group of similar entities and these entities can have attributes.

What is blood bank management system?

Blood Bank Management System (BBMS) is a web based system that can assists the information of blood bag during its handling in the blood bank. With this system, the user of this system can key in the result of blood test that has been conducted to each of the blood bag received by the blood bank.

How do you draw an ER diagram for a project?

How to Draw an Entity Relationship Diagram

1. Determine the Entities in Your ERD. Start by identifying the “what”s in your system or architecture.
2. Add Attributes to Each Entity.
3. Define the Relationships Between Entities.
4. Add Cardinality to Every Relationship.
5. Finish and Save Your ERD.

What is Diamond in ER diagram?

Rectangles represent Entity sets, diamonds represent Relationship sets and ovals represent Attributes of entities or relationships.

What are the requirements for blood bank management system?

Hardware Requirement:  Intel P4 1.5GHz or above.  512MB ram.  80GB HDD Minimum. 8.

What are the features of blood bank management system?

Ability to manage the information of its blood donor. Alerts for blood requirement from registered donors. Auto-check if the person donated blood in the last 3 months. Allows good documentation about the donor and their blood donation activities.

What is double line in ER diagram?

Participation Constraints Total Participation − Each entity is involved in the relationship. Total participation is represented by double lines. Partial participation − Not all entities are involved in the relationship. Partial participation is represented by single lines.

How cardinality is calculated in ER diagram?

Crowsfeet is one of the most popular methods for creating E-R diagrams. With crowsfeet notation, cardinality is represented by decorations on the ends of lines. A cardinality of one is represented by a straight line perpendicular to the relationship line.

What is ER diagram explain with example?

An entity relationship diagram (ERD) shows the relationships of entity sets stored in a database. An entity in this context is an object, a component of data. An entity set is a collection of similar entities. These entities can have attributes that define its properties.