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How is a composite entity represented in an ERD and what is its function?
Wiki User
∙ 12y ago
A Composite Entity is represented by a collection of Inter-related Entity types which togather represent a business Concept. An example of this concept is a Person's Health Record, Equipment Record, Equipment Maintenance Record.
Wiki User
∙ 12y ago
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What is a virtual entity type used to represent multiple entities and relationships in an ERD?
entity cluster
To draw a entity relationship diagram for bus services?
ERD diagrams bus company
Erd diagram on patient information system?
In an Entity-Relationship Diagram for a patient information system, you may have entities like Patient, Doctor, Appointment, Prescription, and Medical Record. The relationships between these entities could include a Patient having many Appointments, a Doctor treating many Patients, and a Prescription being linked to a specific Patient. Attributes for each entity would include things like patient ID, doctor ID, appointment date, prescription details, and diagnosis information.
A common visual model used to guide the design of a database is known as a?
Entity Relationship Diagram, or ERD.
Discuss the difference between a composite key and a composite attribute.How would each be indicated in an ERD?
Attribute is the property of entity.The composite attribute is like address(where street no,house no,town name all include).Composite key is also an attribute,but only which attribute are work as a unique identifier. Example:> In an ERD if vendor placed with orders then order(order day, order number) vendor(vendor code,vendor address) Here, order and vendor both are entity and order number, vendor code both are Composite key(because those are unique)but vendor address is a Composite attribute and order day(may be not unique)is an attribute only. So, we can conclude that all attribute not Composite key.
How does ERD relate to software engineering?
Entity Relationship Diagrams (ERD's) are one of the main tools used in the software design process. Creating an ERD produces a conceptual data model of the information system. It allows software engineers to understand the system data requirements more comprehensively.
What should be the erd for website design?
ERD is an Entity Relationship Diagram which is a graphical representation of database entities (tables, table columns, table definitions, attributes) and inter-relationships between these entities (how the tables are connected).
What is the difference between entity relationship diagram and extended entity relationship diagram?
Realtional databse is the type of databse which is bascially designed to store the deta on OLTP(Online transaction Processing) systems. Entity relatioship databases are basically designed for reporting perpose. It store the Data from OLAP( online Analytical Processing) systems.
What the ERD?
Entity Relationship Diagrams (ERD's) are a way of diagrammatically showing entities in an organisations and how they relate to each other. ERD's show detailed representations of the information that is used in a system and how it relates to other data. There are a number of symbols that represent the entities and the relationships between them; the relationship can be a one to many relationship, many to many or one to one.
What is entity relationship diagrame?
An entity relationship diagram (ERD) represents the entities, or groups of information, and their relationships maintained for a business. An entity relationship diagram represents the entities, or groups of information, and their relationships maintained for a business. An entity relationship diagram represents the entities, or groups of information, and their relationships maintained for a business.
What is ERD?
emergency repair disk: contains information unique to your OS and hard drive, ERD enables restoration on your hard drive of the windows registry, in addition the disk contain information used to build a command window to run DOS-like commands
What is One to one relationship in ERD?
Here is Example!! Entity: PERSON Att:Baby_Name, Father_Name Entity: CITY Att: Country_Name, City_Name, Hospital_Name 1 To 1 Relation: One Baby born at one place(Hospital).
