武汉理工大学 数据库复习题(完整版含答案)
1. Questions
1.1 What is the purpose of a database?
ANSWER:The purpose of a database is to help people track of things.
1.2 What is the most commonly used type of database?
ANSWER: the most commonly used type of database is the relational database.
1.7 Define the terms data and information. Explain how the two terms differ.
ANSWER: Data are recorded facts and numbers.
we can now define information as:
Knowledge derived from data.
Data presented in a meaningful context.
Data processed by summing, ordering, averaging, grouping, comparing or
other similar operations.
1.10 What problem can occur when a database is processed by more than one
user?
ANSWER: When more than one user employs a database application, these is
always the chance that one user's work may interfere with other's.
1.12 What is the purpose of the largest databases at e-commerce companies such
as Amazon.com?
ANSWER: The largest databases are those that track customer browser behavior.
(用来记录用户的浏览行为的。)
1.13 How do the e-commerce companies use these databases? .
ANSWER: E-commerce companies use Web activity databases to determine
which items on a Web page are popular and successful and which are not.
1.14 How do digital dashboard and data mining applications differ from
transaction processing applications?
ANSWER: Digital dashboards and other reporting systems assess past and
current performance. Data mining applications predict future performance.
1.15 Explain why a small database is not necessarily simpler than a large one.
What are the functions of application programs?
ANSWER: Supposed we have 2 company which are different in sales but have
similar database. Though the difference in sale, both have the same kinds of data,
about the same number of tables of data, and the same level of complexity in data
relationships. Only the amount of data varies from one to the other. Thus, although a
database for a small business may be small, it is not necessarily simple.
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