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 Database Questions

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Q:

 Which of the following improves a query's processing time?

A) Write complex queries. B) Combine a table with itself.
C) Query one query within another. D) Use compatible data types.
 
Answer & Explanation Answer: D) Use compatible data types.

Explanation:
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Q:

The FROM SQL clause is used to 

A) specify what table we are selecting or deleting data FROM B) specify search condition  
C) specify range for search condition   D) None of these
 
Answer & Explanation Answer: A) specify what table we are selecting or deleting data FROM

Explanation:
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Q:

 Which of the following occurs when a transaction rereads data it has previously read and finds modification or deletions caused by a committed transaction?

A) Nonrepeatable read B) Phantom read
C) Dirty read D) Consistent read
 
Answer & Explanation Answer: A) Nonrepeatable read

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Q:

 Which of the following is an advantage of partitioning?

A) Complexity B) Inconsistent access speed
C) Extra space D) Security
 
Answer & Explanation Answer: D) Security

Explanation:
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Q:

The time complexity of sequential search is

A) O(n) B) O(2n)
C) O(n^2) D) None
 
Answer & Explanation Answer: A) O(n)

Explanation:

The time complexity of sequential search is O(n)

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Q:

What are different types of DBMS?

Answer

1. DBMS


2. RDBMS (Relational)


3. ORDBMS (Object Relational)


4. DDBMS (Distributed)


5. FDBMS (Federated)


6. HDDBMS (Homogeneous)


7. HDBMS (Hierarchical)


8. NDBMS (Networked)

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Q:

The relationship where both the participating entities belong to same entity type is called

A) Participation B) Recursive
C) Standard D) Normal
 
Answer & Explanation Answer: B) Recursive

Explanation:

The relationship where both the participating entities belong to same entity type is called Recursive relationship

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Q:

Representation level data models provide the concepts that are close to the way many users perceive data

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

High level data models provide the concepts that are close to the way many users perceive data

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