What is a Relation Schema?

The logical structure of a database, including the name and type of each field.

What is the purpose of Requirement Analysis in Database Design?

To understand what data needs to be stored in the database and what operations need to be performed.

What is the Entity-Relationship (ER) Diagram used for?

To model the requirements before creating the relevant tables in a DBMS.

What is the difference between a One-to-One and a One-to-Many relationship?

In a One-to-One relationship, an entity in A is associated with at most one entity in B, while in a One-to-Many relationship, an entity in A can be associated with many entities in B.

What is a Many-to-Many relationship?

An entity in A and B are associated with any numbers.

What is the significance of Key Constraints in ER Models?

They define the uniqueness of relationships, indicating how many entities can be associated with each other.

What is the process of converting an ER Diagram to a Relational Schema?

Entities are translated to relations, and relationships are translated to relations with primary keys from the participating entity sets.

What is the role of a System Analyst in Database Design?

To understand user needs and ensure the database meets those needs.

What is the purpose of Schema Refinement?

To analyze relations to identify potential problems and refine the database design.

What is the importance of Data Models in DBMS?

They provide a high-level description of the data, hiding low-level storage details.

What is the difference between Logical Database Design and Physical Database Design?

Logical Database Design focuses on the database schema, while Physical Database Design considers performance and storage.

What is the role of normalization in database design?

To refine relations and eliminate redundancy.

What is an example of a DBMS?

MySQL, Oracle, Microsoft SQL Server.

What is the significance of cloud technology in databases?

It allows data to be stored anywhere in the world.

What are the disadvantages of storing data in flat text files?

File corruption risk, difficulty in managing numerous files, no concurrency, and lack of security features.

What is the main advantage of using a DBMS over spreadsheets?

DBMS provides better data management, security, and the ability to handle larger datasets.

What is the purpose of an ER Diagram?

To visualize and discuss relationships between entities in a database.

What is a ternary relationship in ER modeling?

A relationship that connects more than two entity sets.

What is the role of attributes in an ER Diagram?

Attributes provide details about entities and are represented as ovals connected to their entity sets.

What is the significance of the primary key in a relational database?

It uniquely identifies each record in a table.

What is the difference between a Relation Instance and a Relation Schema?

A Relation Instance is a snapshot of a table at a specific time, while a Relation Schema defines the structure of the table.

What is the purpose of the application layer in a DBMS?

To provide an interface for users to interact with the database.

What is the role of the database management layer in a DBMS?

To manage the database's data storage, retrieval, and integrity.

What is the significance of data logging in databases?

It helps track access and changes to the data for security and auditing purposes.

What is the impact of data explosion on database systems?

It has led to the rise of data science, machine learning, and artificial intelligence.

What is the main focus of this module?

To understand relational data models and their terminologies.

What is the relationship between entities and attributes in an ER model?

Attributes describe the properties of entities.

What is the purpose of converting an ER model to a relational model?

To create a structured database schema that can be implemented in a DBMS.

What is the significance of understanding user requirements in database design?

It ensures that the database meets the needs of its users and supports the intended applications.

What is the role of constraints in a relational database?

Constraints enforce rules on the data to maintain integrity and consistency.

What is the importance of discussing design choices in ER modeling?

It helps clarify requirements and ensures the model accurately represents the real-world scenario.

What is the relationship between a department and an employee in the context of the Employee Management System?

A department is managed by one employee, and the same employee can manage multiple departments.

What is the significance of the 'Works_in' relationship in the Employee Management System?

It connects employees to the departments they work in.

What is the purpose of the 'Manages' relationship in the Employee Management System?

To indicate which employee manages a specific department.

What is the role of the 'Reports_to' relationship in the Employee Management System?

It defines the supervisory relationships between employees.

What is the significance of the 'since' attribute in relationships?

It indicates the date when the relationship was established.

What is the importance of visualizing relationships in an ER diagram?

It helps stakeholders understand the data structure and relationships before implementation.

What is the impact of using different notations in ER modeling?

Different notations can represent the same relationships but may vary in clarity and detail.

What is the significance of the 'key' attribute in an ER diagram?

It uniquely identifies an entity within an entity set.

What is the role of the 'Entity Set' in an ER model?

It groups similar entities together for easier management and representation.

What is the purpose of the 'Relationship Set' in an ER model?

It groups similar relationships together, allowing for better organization of data.

What is the significance of the 'ER Diagram -Notation'?

It provides a visual representation of entities, attributes, and relationships in a database.

Database Fundamentals and ER Model Flashcards

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128 questions

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1.

FLASHCARD QUESTION

Front

What is a Database?

Back

An organized collection of data, structured in multiple formats, stored in some form of storage medium.

2.

FLASHCARD QUESTION

Front

What does DBMS stand for?

Back

Database Management System.

3.

FLASHCARD QUESTION

Front

What is the Relational Model?

Back

A data model that organizes data into tables (relations) with rows and columns.

4.

FLASHCARD QUESTION

Front

What is an Entity in the context of ER Model?

Back

An abstract object of some sort; a thing (noun).

5.

FLASHCARD QUESTION

Front

What is an Entity Set?

Back

A collection of similar entities; a class of objects.

6.

FLASHCARD QUESTION

Front

What are Attributes in an ER Model?

Back

Properties of entities in an entity set.

7.

FLASHCARD QUESTION

Front

What is a Relationship in an ER Model?

Back

A connection among two or more entity sets.

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