DBMS Questions and Answers updated daily – Computer Knowledge


DBMS Questions and Answers updated daily – Computer Knowledge



218 DBMS Questions and answers section with explanation for various online exam preparation, various interviews, Computer Knowledge DBMS online test. DBMS Questions with detailed description, explanation will help you to master the topic.

DBMS Questions

1. In SQL, which command is used to update existing row in a table?



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Correct Ans:UPDATE
Explanation:


2. In Oracle, who owns the data dictionary?



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Correct Ans:SYS
Explanation:


3. The language used in application programs to request data from the DBMS is referred to as the _______



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Correct Ans:DML
Explanation:


4. ODBC is based on ______



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Correct Ans:Structured Query Language
Explanation:


5. Which of the following is another name for weak entity?



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Correct Ans:Child
Explanation:


6. In oracle, which tablespace is the minimum required when creating a database?



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Correct Ans:System tablespace
Explanation:


7. Which model remains operative until the software is required?



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Correct Ans:Spiral model
Explanation:


8. _______ is used to control privilege in Database.



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Correct Ans:Data Control Language
Explanation:


9. Which TCL command restores the database to last committed state?



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Correct Ans:ROLLBACK
Explanation:


10. Which TCL command is used to permanently save any transaction into database?



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Correct Ans:COMMIT
Explanation:


11. In E-R Diagram, ___________ represents Key Attribute.



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Correct Ans:Ellipse with underlying line
Explanation:


12. Aggregation is a special form of _________



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Correct Ans:Association
Explanation:


13. A top to bottom relationship among the items in a database is established by a ______



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Correct Ans:Hierarchical Schema
Explanation:


14. The highest level in the hierarchy of data organization is called _________



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Correct Ans:data base
Explanation:


15. The management information system (MIS) structure with one main computer system is called a _________



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Correct Ans:Centralized MIS structure
Explanation:


16. Which of the following operator used for appending two strings?



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Correct Ans:||
Explanation:


17. A unit of storage that can store one or more records in a hash file organization is denoted as _______



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Correct Ans:Bucket
Explanation:


18. ___________ is used to save permanently any transaction into database.



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Correct Ans:Commit
Explanation:


19. In SQL, the spaces at the end of the string are removed by _______ function



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Correct Ans:Trim
Explanation:


20. Which command is used to remove a relation from an SQL database?



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Correct Ans:DROP
Explanation:



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