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An E-R diagram may also indicate the cardinality of a relationship. Cardinality is the number of instances of one entity that can, or must, be associated with each instance of another entity. In general we may speak of one-to-one, one-to-many, or many-to-many relationships.
There are several different styles used to draw Entity-Relationship diagrams. The Kendall and Kendall text uses the Crow's Foot notation. Using this notation entities are represented by rectanges and relationships are indicated by lines connecting the rectangles. Cardinality is shown by a series of "tick marks" and "crows feet" superimposed on the relationship lines.
Cardinality in an ER diagram refers to the relationship between two entities. It defines the number of instances of one entity that can be associated with a single instance of another entity. Common cardinality notations include one-to-one, one-to-many, and many-to-many relationships.
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How do you tell between the Endoplasmic Reticulum and Golgi Apparatus in a bad diagram?
In a bad diagram, look for characteristics like flattened sacs and vesicles in close proximity, which indicate the Golgi Apparatus, and tubular structures with ribosomes attached, which indicate the Endoplasmic Reticulum. The Golgi is usually located close to the cell membrane, while the ER is connected to the nuclear envelope.
What the is difference between rough ER smooth ER?
Rough endoplasmic reticulum (ER) has ribosomes attached to its surface, giving it a bumpy appearance, and is responsible for protein synthesis and processing. Smooth ER lacks ribosomes and is involved in lipid metabolism, detoxification, and storage of calcium ions.
How does smooth ER differ from rough ER?
Smooth endoplasmic reticulum (ER) lacks ribosomes on its surface, while rough ER has ribosomes attached. Rough ER is involved in protein synthesis and processing, while smooth ER is involved in lipid synthesis, detoxification, and calcium storage.
is a er in a plant cell or animal cell?
They both have the Endoplasmic Reticulum (ER).
What are two types of ER?
The two types of ER (Entity-Relationship) models commonly used in database design are the conceptual ER model, which describes the high-level concepts and relationships in a system, and the logical ER model, which defines the structure and constraints of the database in more detail.
What is cardinality ratio in ER diagram?
It specify the number of relationship instances that an entity can participate in.
What are the differences between EER diagrams and ER diagrams?
Extended ER diagram is a variant of ER diagram. EER include ER diagram + hierarichal concept. Extended ER diagram is also called Enhance ER diagram(EER).
What is the ER diagram of a school management system?
An ER diagram for a school management system typically includes entities such as Student, Teacher, Course, Classroom, and Enrollment. Relationships between these entities can be depicted using cardinality and participation constraints to show how they are connected (e.g., a student enrolls in courses taught by teachers in specific classrooms). The ER diagram serves as a visual representation of the database schema for the school management system.
Drow a er diagram of a supermarket?
supermarket (ER-Diagram)
How can you make Er diagram of online shopping?
Er diagram of on line shopping
An ER diagram for a website?
I 'm need ER diagram for websit news
Where can you find an ER diagram on online shopping?
ER Diagram of online shopping
How do you draw the ER Diagram for online tour site?
draw the er diagram for tours
How do you draw a ER diagram for an automobile industry?
How do you draw a ER diagram for a automobile industry?
How do you draw the ER diagram of bus reservation?
You also can draw your ER diagram by so many ways. A software called Edraw is a better software to draw the ER diagram. This one has some ready-to-use ER diagrams templates conceptdraw.com/How-To-Guide/er-diagram
How is Er diagram of human resource management?
Er diagram of human resource managenent system
Er diagram on regional transport office project?
er diagram for rto management system
