[DSS03B-ID] Entity Relationship Modeling Part 1
Summary
TLDRThis lecture introduces Module 8 on Entity Relationship Modeling in relational database systems. It explains the four components of an ER diagram: entities, relationships, attributes, and multiplicity. The example given involves two entities, 'customer' and 'order,' with a one-to-many relationship. The lecture also touches on the types of relationships (binary, ternary, and quaternary) and the concept of recursive relationships. It distinguishes between strong and weak entities, with the latter being dependent on a parent entity. Further details on attributes and multiplicity are promised in Module 9.
Takeaways
- π The lecture is about Module 8 of the database system course.
- π It focuses on Entity Relationship Modeling (ERM) in relational modeling.
- π ERM can be visualized using an Entity Relationship Diagram (ERD).
- π ERD consists of four components: Entities, Relationships, Attributes, and Multiplicity.
- π₯ An example in the script shows two entities and one relationship between them.
- π’ The 'customer' entity has four attributes, and the 'order' entity has three attributes.
- π Multiplicity 'one to many' between 'customer' and 'order' means one customer can have multiple orders, but one order is made by one customer.
- π’ There are three types of relationships based on the degree: binary (degree 2), ternary (degree 3), and quaternary (degree 4).
- π Recursive relationships are those that connect the same entity with different roles, like supervisor and supervisee.
- πͺ Strong entities can exist independently, like 'customer', while weak entities depend on the existence of their parent entity, like 'reference'.
- π More details about attributes and multiplicity will be explained in Module 9.
Q & A
What is the main topic of the lecture?
-The main topic of the lecture is Module 8, which discusses Entity Relationship Modeling in relational database systems.
What are the four components of an Entity Relationship Diagram?
-The four components of an Entity Relationship Diagram are entities, relationships, attributes, and multiplicity.
What is an example of an entity mentioned in the script?
-An example of an entity mentioned in the script is 'customer', which has four attributes.
What is an example of a relationship mentioned in the script?
-The script mentions a relationship between 'customer' and 'order' entities.
What does the multiplicity 'one to many' represent?
-The multiplicity 'one to many' represents that one customer can make many orders, and one order is made by one customer.
What are the three types of relationships based on degree?
-The three types of relationships based on degree are binary (degree 2), ternary (degree 3), and quaternary (degree 4).
What is a recursive relationship?
-A recursive relationship is a relationship that connects the same entity type but with different roles, such as supervisor and supervisee.
What is the difference between strong and weak entities?
-A strong entity can exist independently, while a weak entity cannot exist without its parent entity.
Can you provide an example of a strong entity from the script?
-An example of a strong entity from the script is 'customer'.
What is the role of a weak entity?
-A weak entity depends on a strong entity and must be owned by it, such as 'referensis' which must be owned by 'customer'.
What will be discussed in the next module?
-The next module will discuss attributes and multiplicity in more detail.
Outlines
π Introduction to Entity Relationship Modeling
The paragraph introduces the topic of Entity Relationship Modeling (ERM) in the context of database systems. It discusses the components of an ER diagram, which include entities, relationships, attributes, and multiplicity. An example is provided with two entities and a relationship between them. The entities 'customer' and 'order' are described with their respective attributes, and the multiplicity between them is explained as 'one to many'. The paragraph also touches on the different types of relationships (binary, ternary, and quaternary) and the concept of recursive relationships. It distinguishes between strong and weak entities, with strong entities being independent and weak entities dependent on a parent entity. The explanation of attributes and multiplicity is said to continue in the next module.
Mindmap
Keywords
π‘Database System
π‘Entity Relationship Modeling (ERM)
π‘Entity
π‘Relationship
π‘Attribute
π‘Multiplicity
π‘Binary Relationship
π‘Ternary Relationship
π‘Quaternary Relationship
π‘Recursive Relationship
π‘Strong Entity
π‘Weak Entity
Highlights
Introduction to Module 8 on Database Systems focusing on Entity Relationship Modeling.
Explanation of how to represent relational modeling with an Entity Relationship Diagram (ERD).
ERD consists of four components: entities, relationships, attributes, and multiplicity.
Example in the diagram shows two entities and one relationship.
Customer entity has four attributes.
Order entity has three attributes.
Multiplicity 'one to many' between customer and order entities.
One customer can make many orders, and one order is made by one customer.
Three types of relationships based on degree: binary, ternary, and quaternary.
Binary relationship involves two entities.
Ternary relationship involves three entities.
Quaternary relationship involves four entities.
Introduction to recursive relationships connecting the same entity with different roles.
Example of recursive relationship: staff connected to staff as supervisor and supervisee.
Types of entities: Strong and Weak.
Strong entity can exist independently, like a customer.
Weak entity cannot exist without its parent entity, like a reference.
Weak entities must be owned by a strong entity.
Attributes and multiplicity will be explained in Module 9.
Conclusion of the explanation and hope for its usefulness.
Transcripts
Selamat datang kembali pada mata kuliah
database system saya akan membahas eh
modul 8 yang akan eh membahas tentang
entity relationip modeling bagian
pertama dalam pemodelan relasional bisa
digambarkan dengan entity relasional
diagram dengan diagram tersebut terdiri
dari empat komponen yang pertama adalah
entitas kedua relationship ketiga
attribute dan keempat
multiplicity contoh pada gambar berikut
ada dua entitas dan satu relationship
yang menghubungkan kedua entitas
tersebut entitas customer memiliki empat
atribut serta entitas order memiliki
tiga atribut sedangkan multiplicity one
to many antara customer dan order
artinya satu customer bisa melakukan
Banyak order dan satu order dilakukan
oleh satu
customer Terdapat tiga jenis
relationship berdasarkan eh degreenya
degree of rel
relationship menunjukkan jumlah entitas
yang terlibat pada sebuah
relationship pertama binary relationship
dengan degre du kedua ter relationship
dengan degeri 3 eh ketiga eh quarary
relationship dengan degi 4 kemudian ada
recursive relationship yakni
relationship yang menghubungkan entitas
yang sama dengan role yang
berbeda misalnya staf terhubung dengan
staf di mana role pertama sebagai
supervisor dan role kedua Sebagai
supervis terakhir jenis entitas ada
Strong dan weak strong entity berarti
keberadaannya bisa berdiri sendiri
contohnya klien sedangkan weak entity
tidak bisa berdiri sendiri tanpa
keberadaan entitas parent-nya
misalnya
referensis entitas ini harus memilik
dimiliki oleh entitas klien mengenai
atribut dan multiplicity akan dijelaskan
pada modul kees9 e demikian penjelasan
dari saya terima kasih semoga berguna
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