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 Database Questions

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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:

 A supertype/subtype hierarchy has which of the following features?

A) Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype. B) Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype.
C) Attributes are assigned at the highest logical level. D) Attributes are assigned at the lowest logical level.
 
Answer & Explanation Answer: C) Attributes are assigned at the highest logical level.

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Q:

 A composite attribute is which of the following?

A) An attribute that can be broken into components B) An attribute that cannot be broken into components
C) Multiple attributes D) An identifier
 
Answer & Explanation Answer: A) An attribute that can be broken into components

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Q:

 To drop a column that is used as a foreign key, first:

A) drop the primary key. B) drop the table containing the foreign key..
C) drop the foreign key constraint. D) All of the above must be done.
 
Answer & Explanation Answer: C) drop the foreign key constraint.

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Q:

 When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?

A) Disjoint with total specialization B) Disjoint with partial specialization
C) Overlap with total specialization D) Overlap with partial specialization
 
Answer & Explanation Answer: C) Overlap with total specialization

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Q:

 The process of reading a database schema and producing a data model from that schema is known as:

A) data modeling. B) database design.
C) reverse engineering. D) None of the above is correct.
 
Answer & Explanation Answer: C) reverse engineering.

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Q:

An entity is a thing in the real world with an independent existence.

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

Explanation:

Entity is a real world object

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Subject: Database
Job Role: Database Administration

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Q:

The command to eliminate a table from a database is

A) REMOVE TABLE CUSTOMER; B) UPDATE TABLE CUSTOMER;
C) DELETE TABLE CUSTOMER; D) DROP TABLE CUSTOMER;
 
Answer & Explanation Answer: D) DROP TABLE CUSTOMER;

Explanation:

The SQL DROP TABLE statement is used to remove a table definition and all data, indexes,...

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