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Q:

 If a table has been normalized so that all determinants are candidate keys, then that table is in:

A) 1NF B) 2NF
C) 3NF D) BCNF
 
Answer & Explanation Answer: D) BCNF

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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.

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Q:

 To remove duplicate rows from the results of an SQL SELECT statement, the ________ qualifier specified must be included.

A) ONLY B) DISTINCT
C) UNIQUE D) SINGLE
 
Answer & Explanation Answer: B) DISTINCT

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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.

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Q:

 ON UPDATE CASCADE ensures which of the following?

A) Normalization B) Data Integrity
C) Materialized Views D) All of the above.
 
Answer & Explanation Answer: B) Data Integrity

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Q:

 Which of the following is the original purpose of SQL?

A) To specify the syntax and semantics of SQL data definition language B) To specify the syntax and semantics of SQL manipulation language
C) To define the data structures D) All of the above.
 
Answer & Explanation Answer: D) All of the above.

Explanation:

SQL is a domain-specific language used in programming and designed for managing data held in a relational database management system, or for stream processing in a relational data stream management system.

 

Purpose of SQL are ::

* To define the data structures

* To specify the syntax and semantics of SQL manipulation language

* To specify the syntax and semantics of SQL data definition language

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Q:

Using OQL, you may do which of the following?

A) Return an entire collection of elements including duplicates. B) Return a collection of elements without duplicates.
C) Return a specific subset of elements using a given criteria. D) All of the above.
 
Answer & Explanation Answer: D) All of the above.

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Q:

 The object definition language (ODL) is which of the following?

A) Used to develop logical schemas B) A data definition language for OODB
C) A method to implement a logical schema D) All of the above.
 
Answer & Explanation Answer: D) All of the above.

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