ER diagrams display the relationships between entity sets stored in a database and help explain the logical structure of databases. They specify what data will be stored through entities and their attributes, and how entities relate to each other. ER diagrams represent data graphically and are essential for modeling the data stored in a database, as the basic design of a database is built upon the ER diagram.

1. DBMS ISE 1
E-R MODEL
Presented by-
PRN No.: 1910049
Class: T.Y. B. Tech.

2. ER Diagram stands for Entity Relationship
Diagram,
also known as ERD is a diagram that displays
the relationship of entity sets stored in a
database.
In other words, ER diagrams help to explain
the logical structure of databases.
What is ERdiagram?

3. Need of E-RDiagram
An entity-relationship diagram, or ER diagram, is
essential for modeling the data stored in a
database.
It is the basic design upon which a database
is built.
ER diagrams specify what data we will store:
the entities and their attributes. They also show
how entities relate to other entities.
Another advantage of E-R diagram is that
they represent the data in a graphical manner.

4. Rectangle represents the
entity sets.
Ellipse represents the
attributes.
Diamond represents the
relationship sets.
Lines link attributes to entity
sets and entity sets to
relationship sets.
Double ellipse represents
multivalued attributes.
Dashed ellipse represents
the derived attributes.
Primary key attributes are
underlined.
Components of ERdiagram

6. Thus, we have studied what is E-R Diagram, what
are the components of the E-R diagram.
We have also seen how attributes and entity sets
are related to each other.
Conclusion

7. Thank you!
Do you have any questions for us?