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misy 5335 Exam/ 93 Questions with Definitive Solutions/ . Terms like: Why Use a Database? - Answer: A database is used to help people keep track of things, and the most commonly used type of database is the relational database, although nonrelational databases (which are used extensively in onl...

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  • October 1, 2024
  • 15
  • 2024/2025
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misy 5335 Exam/ 93 Questions with Definitive
Solutions/ 2024-2025.
Why Use a Database? - Answer: A database is used to help people keep track of
things, and the most commonly used type of database is the relational database,
although nonrelational databases (which are used extensively in online
applications such as Facebook and Twitter) are now also widely used.


What are the Problems with Using Lists? - Answer: making changes to this list
causes ...modification problems.


Modification problem - Answer: A situation that exists when the storing of one
row in a table records facts about two themes or the deletion of a row removes



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, facts about two themes, or when a data change must be made in multiple rows
for consistency.


null values - Answer: means a missing value. Are always problematic and that we
want to avoid them whenever possible.


relational model - Answer: A data model in which data are stored in relations and
relationships between rows are represented by data values.


relational database - Answer: contains a collection of separate tables


table - Answer: holds data about one and only one theme in most circumstances.


row - Answer: has data about a particular occurrence or instance of the thing of
interest...A group of columns in a table. All the columns in a row pertain to the
same entity. Also known as tuple or record.


instance - Answer: A specific occurrence of an object of interest.


Record - Answer: (1) A group of fields pertaining to the same entity; used in file-
processing systems. (2) In the relational model, a synonym for row and tuple.


column - Answer: stores a characteristic common to all rows...A logical group of
bytes in a row of a relation or a table. The meaning of a column is the same for
every row of the relation, and represents an attribute of a relation.

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