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Relational Database Fundamentals Study Questions Solved 100% Correc
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Relational Database FundamentalsStudy Questions Solved 100% Correct
What is one advantage of the three-tier database architecture over the two-tier
architecture? - ANSWER The centralized application logic makes maintaining
the application easier.
For the Census relation shown in the exhibit, what do the values "Heer, Cain and
Shaw" represent? - ANSWER The values of one attribute in the relation
In a relational database, which term describes a collection of one set of attributes in
a table? - ANSWER Tuple
Where does a DBMS store information about the relations, attributes, constraints,
views, etc., used in a database? - ANSWER In the data dictionary
In a relational database, a row or record is also referred to as a(n): - ANSWER tuple.
Entities can best be described as: - ANSWER logical categories that make up a
database, as opposed to the actual data items that inhabit the entity.
The CREATE SCHEMA command is a command from which subset of SQL?
- ANSWER Data Definition Language (DDL)
Consider the SQL statement shown in the exhibit. This statement applies what type of
constraint(s)? - ANSWER Domain constraints and entity integrity constraints
, The INSERT command is a command from which subset of SQL? - ANSWER Data
Manipulation Language (DML)
How many tables are involved in a n-ary relationship? - ANSWER More than three
Consider the SQL statement shown in the exhibit. This statement applies what type of
constraint(s)?
CREATE TABLE Hardware
(hardware_id INTEGER NOT NULL PRIMARY
KEY, hardware_name VARCHAR (25) NOT NULL,
hardware_description VARCHAR (50) NOT NULL); - ANSWER Domain constraints and
entity integrity constraints
What can be said about the two relations shown in the exhibit? - ANSWER The
Employee relation is a strong entity, whereas the Phone relation is a weak entity.
Which statement accurately describes a characteristic of attributes? - ANSWER
Every attribute in a relation must have a defined domain.
In a data model, what does structural information describe? - ANSWER A set of rules by
which the database can be built
The SELECT command is a command from which subset of SQL? - ANSWER
Data Manipulation Language (DML)
A brood mare may give birth to several foals over her lifetime, but each foal has only
one mother. What is the cardinality of the relationship between brood mares and foals?
- ANSWER 1:n
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