Database - Data Modeling
- Option : A
- Explanation : A method in which records are physically stored in a specified order according to a key field in each record is hash.(In hash method,a hash function is performed on the key value to determine the unique physical address of the record to store or retrieve)
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- Option : C
- Explanation : A subschema expresses the external view. (External schemas are called also called as subschemas)
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13. Which one of the following statements is false?
- A
The data dictionary is normally maintained by the database administrator.
- B
Data elements in the database can be modified by changing the data dictionary.
- C
Data elements in the database can be modified by changing the data dictionary.
- D
The data dictionary is a tool used exclusively by the database administrator.
- Option : B
- Explanation :
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14. An advantage of the database management approach is
- Option : C
- Explanation :
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15. A DBMS query language is designed to
- Option : D
- Explanation :
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