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Questions and Answers
What is the purpose of a database system?
What is the purpose of a database system?
- To analyze market trends
- To create graphical user interfaces
- To design web applications
- To store and manage data in a structured manner (correct)
What is a primary key in the context of a relational database design?
What is a primary key in the context of a relational database design?
- A field that stores only numeric values
- A non-unique identifier for each record in a table
- A field that allows null values
- A unique identifier for each record in a table (correct)
What does the term 'Entity Relationship Model' primarily focus on?
What does the term 'Entity Relationship Model' primarily focus on?
- User interface design
- Entities and their relationships in a database (correct)
- Market segmentation strategies
- Data visualization techniques
Explain the purpose of database systems.
Explain the purpose of database systems.
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What is an entity relationship model and what does it represent?
What is an entity relationship model and what does it represent?
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What is a primary key in the context of a relational database design?
What is a primary key in the context of a relational database design?
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Study Notes
Purpose of a Database System
- Manages and organizes data for efficient storage, retrieval, and manipulation.
- Provides a systematic way to store and access large amounts of data securely.
- Supports consistency and integrity of data through predefined structures and processes.
- Facilitates multi-user access, enabling concurrent transactions and operations.
Primary Key in Relational Database Design
- A primary key uniquely identifies each record in a database table, ensuring no duplicate entries.
- Must contain unique values and cannot be null, maintaining the integrity of the data.
- Often composed of a single field, but can also be a combination of multiple fields (composite key).
- Helps establish relationships between different tables in a relational database.
Entity Relationship Model (ERM)
- Focuses on defining data structures and relationships between entities within a system.
- Represents entities (objects or concepts) and their attributes, showing how they interact with one another.
- Uses graphical notation for visual representation, making database design more intuitive.
- Central to the database design process, assisting in the creation of a logical framework before physical implementation.
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