Database Flatfile - Quiz Explanation
The correct answers are indicated below, along with text that explains the correct answers.
1.
What does "flat file" refer to?
Please select the best answer.
A.
A type of database storage method where all of the data elements are stored on top of each other
B.
A fully-relational database system like Microsoft's SQL Server or Oracle's database systems
C.
Non-relational systems that typically store each table and index in separate files and often do not support the SQL language
D.
None of the above
The correct answer is C.
Flat file systems include xBase systems, Btrieve, and FoxPro databases. These systems are typically PC-based and often do not directly have a capability to query the database with SQL.
2.
Which of the following statements is true?
Please select the best answer.
A.
Flat file database systems pay more attention to retrieving data and making it accessible to the user, whereas relational databases spend more energy updating indexes and data pointers.
B.
Relational database systems are the main thrust behind SQL since it provides the language elements needed to tie together the information in the database.
C.
Relational systems pay more attention to retrieving data and making it accessible to the user.
D.
Both B and C
The correct answer is D.
Relational database systems, the foundation for the SQL language and its capabilities, are built to be more accessible, and are much more contained, typically having only one physical file on disk that contains the database and index files.
3.
Which of these predicates are propositions?
Please select the best answer.
A.
The sun is made of orange juice
B.
y + x > y
C.
There exists a database management system that is truly relational
D.
5 is an even number
The correct answer is B.
Predicate. It is equivalent to the predicate x > 0.
x
