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Questions and Answers
A data model is usually graphical.
A data model is usually graphical.
True
An implementation-ready data model needn't necessarily contain enforceable rules to guarantee the integrity of the data.
An implementation-ready data model needn't necessarily contain enforceable rules to guarantee the integrity of the data.
False
An implementation-ready data model should contain a description of the data structure that will store the end-user data.
An implementation-ready data model should contain a description of the data structure that will store the end-user data.
True
Within the database environment, a data model represents data structures with the purpose of supporting a specific problem domain.
Within the database environment, a data model represents data structures with the purpose of supporting a specific problem domain.
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Even when a good database blueprint is available, an applications programmer’s view of the data should match that of the manager and the end user.
Even when a good database blueprint is available, an applications programmer’s view of the data should match that of the manager and the end user.
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In the context of data models, an entity is a person, place, thing, or event about which data will be collected and stored.
In the context of data models, an entity is a person, place, thing, or event about which data will be collected and stored.
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Database designers determine the data and information that yield the required understanding of the entire business.
Database designers determine the data and information that yield the required understanding of the entire business.
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Business rules apply to businesses and government groups, but not to other types of organizations such as religious groups or research laboratories.
Business rules apply to businesses and government groups, but not to other types of organizations such as religious groups or research laboratories.
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Business rules must be rendered in writing.
Business rules must be rendered in writing.
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A disadvantage of the relational database management system (RDBMS) is its inability to hide the complexities of the relational model from the user.
A disadvantage of the relational database management system (RDBMS) is its inability to hide the complexities of the relational model from the user.
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In an SQL-based relational database, each table is dependent on every other table.
In an SQL-based relational database, each table is dependent on every other table.
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In an SQL-based relational database, rows in different tables are related based on common values in common attributes.
In an SQL-based relational database, rows in different tables are related based on common values in common attributes.
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Each row in the relational table is known as an entity instance or entity occurrence in the ER model.
Each row in the relational table is known as an entity instance or entity occurrence in the ER model.
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Study Notes
Data Models
- Data Models are typically graphical representations.
- Implementation-ready data models need to contain rules to ensure data integrity.
- Implementation-ready data models should include a description of the data structure that will be used to store end-user data.
- Data models represent data structures within a database to aid in a specific problem domain.
- Data models are essential for communication across different perspectives, including application programmers, managers, and end users.
- An entity represents a person, place, thing, or event for which data will be collected and stored.
- Business rules dictate the data and information needed to understand a business.
- Business rules are applicable to various organizations, including those in business, government, religious groups, and research laboratories.
- Business rules should always be written down.
- The Relational Database Management System (RDBMS) is advantageous because it hides complex aspects of the relational model from users.
- In a relational database using SQL, tables are not dependent on each other.
- In SQL-based relational databases, rows in different tables are related based on shared values in common attributes.
- In the Entity Relationship (ER) model, each row in the relational table is considered an entity instance or entity occurrence.
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Description
Test your understanding of data models, including their graphical representations and the importance of business rules. This quiz covers fundamental concepts essential for effective data management and integrity in relational databases. Prepare to explore the roles of entities and how these models aid various stakeholders in an organization.
