TNPSC-2017-Polytechnic-CS
November 11, 2023Topologies
November 11, 2023Database-Management-System
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Question 412
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Logical data independence is the ability to change________schema without having to change_____ Schema
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internal; external
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conceptual; internal
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conceptual; external
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internal; conceptual
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Question 412 Explanation:
The three-schema approach provides for three types of schemas with schema techniques based on formal language descriptions:
→External schema for user views
→Conceptual schema integrates external schemata
→Internal schema that defines physical storage structures
→External schema for user views
→Conceptual schema integrates external schemata
→Internal schema that defines physical storage structures
Correct Answer: C
Question 412 Explanation:
The three-schema approach provides for three types of schemas with schema techniques based on formal language descriptions:
→External schema for user views
→Conceptual schema integrates external schemata
→Internal schema that defines physical storage structures
→External schema for user views
→Conceptual schema integrates external schemata
→Internal schema that defines physical storage structures