Entity Relationship (ER) Diagram Assignment Help Australia

An Entity-Relationship (ER) diagram is an illustrative depiction of a system that showcases the relationship between people, objects, places, concepts or events within that particular system. An ER diagram is a technique of data modeling that can help define the business actions and can be used as the base for a relational database in various fields such as software engineering, education and research, business information systems, etc. Students studying the subject often face difficult situations where they get confuse and seek assistance from professional experts. TutorVersal is one stop solution where you can get the best Entity Relationship (ER) diagram assignment help from expert assignment writers.

Entity Relationship (ER) diagram also referred as ER Models use specific symbols like rectangles, ovals, diamonds and lines to illustrate the inter-connectedness of relationships, entities and the attributes. They reflect the grammatical structure that encapsulates entities and relationships as nouns and verbs, respectively.

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The Entity Relationship (ER) diagrams are associated with the Data Structure Diagram’s (DSD’s) which target on the relationships within the entities rather than targeting on relationships between entities.

The Entity Relationship (ER) diagrams are also used in conjointment with the Data Flow Diagram’s (DFD’s) that bring out the flow of reliable information for the systems and processes.

Purpose of Entity Relationship (ER) Diagrams

• Database Troubleshooting: The Entity Relationship (ER) diagrams are basically used to examine the prevailing databases in order to search and resolve difficulties logically. By making the diagram one could easily figure out where it’s going wrong.
• Business Process Re-engineering (BPR): Here the Entity Relationship (ER) diagrams help in examining the databases that are used in Business Process Re-engineering (BPR) and in creating all new databases.
• Database Design: In this category the Entity Relationship (ER) diagrams are used for creating and outlining the relational databases, in logical and business rules (i.e. in a logical data) and in the specific technology that is to be implemented (i.e. in a physical data.) In the case of software engineering, an Entity Relationship (ER) diagram is usually the main and primary step in determining the requirements for a system project on information. Later it is also used to create a database or databases.
• Business Information Systems: Here the diagram is used to construct and evaluate relational databases that are used in business development. Any operations made by firms that utilize fielded data comprising of actions, entities and teamwork can possibly gain benefit from the relational databases. It can easily display information, accumulate processes and improve the end results.
• Research: Since majority of the research focuses on the structured data, Entity Relationship (ER) diagrams can play an important role in creating functional databases to evaluate the data.
• Education: Today, the databases are a method of accumulating related information for the purpose of education and later recall, so Entity Relationship (ER) diagrams can be highly valuable in planning and formulating the data structures.

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Different Components and Features of an Entity Relationship (ER) Diagram

An Entity Relationship (ER) Diagram is made of relationships, entities and attributes. They depict cardinality that defines the relationship in numbers. Have a look:

• Relationships: It is the relationship of how the entities act upon one another. Relationships are generally shown in diamonds or labels.
• Recursive Relationship: The entities participate more than once in the recursive relationship.
• Entities: Any definable thing like a particular person, concept, event or object that have stored data.
• Entity Type: Anything that can be defined such as student or subject. However the entity would be specific to either student or subject.
• Entity Set: Similar to the entity type, but is defined at a distinct period of time.
• Entity Category: Entities are defined in different categories such as associative, strong or weak. A strong entity can easily be illustrated by its very own attributes; however a weak entity cannot be illustrated by its own attributes. An associative entity connects the elements within an entity set.
• Entity Key: It primarily refers to a characteristic that can define an entity within the entity set uniquely. Super, primary, foreign, candidate are called as entity keys.
• Attribute: It is the characteristics of an entity that are generally shown as a circle or an oval.
• Descriptive Attributes: The characteristics or property of a particular relationship is called descriptive attributes.
• Attribute Categories: The attributes are categorized as, simple: meaning that the attribute value cannot be further divided. Composite: sub-category of attributes bounces from the features. Derived: An attribute is derived or calculated from another characteristic.
• Multi-value: In this more than one attribute is denoted.
• Single-value: It has only one attribute value.

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