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Which of the following statements is true ?
- a)The entity-relationship data model is an example of implementation data models.
- b)A conceptual schema can be defined using an E-R model.
- c)E-R model is used in a phase called physical database design.
- d)E-R model is used in a phase called conceptual database design.
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Which of the following statements is true ?a)The entity-relationship d...
The initial phase of database design is to characterize fully the data needs of the prospective database user.The outcome of this phase is a specification of user requirements. Next, the designer chooses a data model and by applying the concepts of the chosen data model, translates these requirements into a conceptual schema of the database. The E-R model, is typically used to represent the conceptual design.
Most Upvoted Answer
Which of the following statements is true ?a)The entity-relationship d...
Explanation:
The entity-relationship (E-R) model is a graphical approach used to describe the information or data in a database. It is used in the early stages of database design, particularly in the conceptual database design phase. The following statements explain why option 'D' is the correct answer:
Conceptual Database Design:
Conceptual database design is the first stage of database design, which involves creating a high-level description of the data to be stored in the database. The conceptual schema is a representation of the data requirements of the organization, independent of any specific database management system (DBMS) or physical implementation. E-R model is used to create a conceptual schema that represents the entities, attributes, and relationships between them.
Entity-Relationship Data Model:
The E-R model is a type of conceptual data model that represents the real-world entities and their relationships with each other. It was originally proposed by Peter Chen in 1976 and has become a widely accepted standard for database design. The E-R model uses various symbols to represent entities, attributes, and relationships, which are used to create a graphical representation of the database.
Implementation Data Models:
Implementation data models are used to represent the database schema in a specific DBMS, such as Oracle, MySQL, or SQL Server. These models are used in the physical database design phase, which involves creating the actual database using the DBMS. Implementation data models include the database schema, which is a detailed description of the data structures and relationships between them.
Conclusion:
In summary, option 'D' is the correct answer because the E-R model is used in the conceptual database design phase and not in the implementation data models. The E-R model is used to create a conceptual schema that represents the data requirements of the organization, independent of any specific DBMS or physical implementation.
The entity-relationship (E-R) model is a graphical approach used to describe the information or data in a database. It is used in the early stages of database design, particularly in the conceptual database design phase. The following statements explain why option 'D' is the correct answer:
Conceptual Database Design:
Conceptual database design is the first stage of database design, which involves creating a high-level description of the data to be stored in the database. The conceptual schema is a representation of the data requirements of the organization, independent of any specific database management system (DBMS) or physical implementation. E-R model is used to create a conceptual schema that represents the entities, attributes, and relationships between them.
Entity-Relationship Data Model:
The E-R model is a type of conceptual data model that represents the real-world entities and their relationships with each other. It was originally proposed by Peter Chen in 1976 and has become a widely accepted standard for database design. The E-R model uses various symbols to represent entities, attributes, and relationships, which are used to create a graphical representation of the database.
Implementation Data Models:
Implementation data models are used to represent the database schema in a specific DBMS, such as Oracle, MySQL, or SQL Server. These models are used in the physical database design phase, which involves creating the actual database using the DBMS. Implementation data models include the database schema, which is a detailed description of the data structures and relationships between them.
Conclusion:
In summary, option 'D' is the correct answer because the E-R model is used in the conceptual database design phase and not in the implementation data models. The E-R model is used to create a conceptual schema that represents the data requirements of the organization, independent of any specific DBMS or physical implementation.
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Which of the following statements is true ?a)The entity-relationship data model is an example of implementation data models.b)A conceptual schema can be defined using an E-R model.c)E-R model is used in a phase called physical database design.d)E-R model is used in a phase called conceptual database design.Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements is true ?a)The entity-relationship data model is an example of implementation data models.b)A conceptual schema can be defined using an E-R model.c)E-R model is used in a phase called physical database design.d)E-R model is used in a phase called conceptual database design.Correct answer is option 'D'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about Which of the following statements is true ?a)The entity-relationship data model is an example of implementation data models.b)A conceptual schema can be defined using an E-R model.c)E-R model is used in a phase called physical database design.d)E-R model is used in a phase called conceptual database design.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is true ?a)The entity-relationship data model is an example of implementation data models.b)A conceptual schema can be defined using an E-R model.c)E-R model is used in a phase called physical database design.d)E-R model is used in a phase called conceptual database design.Correct answer is option 'D'. Can you explain this answer?.
Which of the following statements is true ?a)The entity-relationship data model is an example of implementation data models.b)A conceptual schema can be defined using an E-R model.c)E-R model is used in a phase called physical database design.d)E-R model is used in a phase called conceptual database design.Correct answer is option 'D'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about Which of the following statements is true ?a)The entity-relationship data model is an example of implementation data models.b)A conceptual schema can be defined using an E-R model.c)E-R model is used in a phase called physical database design.d)E-R model is used in a phase called conceptual database design.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is true ?a)The entity-relationship data model is an example of implementation data models.b)A conceptual schema can be defined using an E-R model.c)E-R model is used in a phase called physical database design.d)E-R model is used in a phase called conceptual database design.Correct answer is option 'D'. Can you explain this answer?.
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