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 Database Questions

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Q:

It is necessary to sort a file before searching a particular item 

A) True B) False
C) May or may not be true D) None of the above
 
Answer & Explanation Answer: C) May or may not be true

Explanation:

If less work is involved in searching a element than to sort and then extract, then we don’t go for sort

If frequent use of the file is required for the purpose of retrieving specific element, it is more efficient to sort the file.

Thus it depends on situation

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Job Role: Database Administration

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Q:

 The HAVING clause does which of the following?

A) Acts like a WHERE clause but is used for groups rather than rows. B) Acts like a WHERE clause but is used for rows rather than columns.
C) Acts like a WHERE clause but is used for columns rather than groups. D) Acts EXACTLY like a WHERE clause.
 
Answer & Explanation Answer: A) Acts like a WHERE clause but is used for groups rather than rows.

Explanation:
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Q:

Which of the following is true about cloud computing?

A) Cloud computing has brought about a drop in hardware and software sales, while augmenting service revenues B) You can access your data from any computer in the world, as long as you have an Internet connection.
C) Both A & B D) It's always going to be less expensive and more secure than local computing.
 
Answer & Explanation Answer: C) Both A & B

Explanation:
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Job Role: Database Administration , IT Trainer , Project Manager

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Q:

 When three or more AND and OR conditions are combined, it is easier to use the SQL keyword(s):

A) LIKE only. B) IN only.
C) NOT IN only. D) Both IN and NOT IN.
 
Answer & Explanation Answer: D) Both IN and NOT IN.

Explanation:
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Q:

 A benefit of the three-tier architecture is which of the following?

A) New modules can be built to support specific business needs B) Performance improves for compiled SQL statements
C) Results in a thinner client and database server D) All of the above.
 
Answer & Explanation Answer: A) New modules can be built to support specific business needs

Explanation:
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Q:

Which of the following products implemented the CODASYL DBTG model?

A) IDMS B) DB2
C) dBase-II D) R:base
 
Answer & Explanation Answer: A) IDMS

Explanation:
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Q:

 When assessing the table structure of an acquired set of tables with data, accessing the validity of possible referential integrity constraints on foreign keys is (part of) the:

A) first step. B) second step.
C) third step. D) fourth step.
 
Answer & Explanation Answer: C) third step.

Explanation:
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Q:

Which type of entity is related to two or more associated entities that each contain specialized attributes that apply to some but not all of the instances of the entity?

A) Supertype entity B) Subtype entity
C) Archetype entity D) Instance entity
 
Answer & Explanation Answer: A) Supertype entity

Explanation:
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