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Database作业代写服务优势
CS作业代写一直是我们的王牌代写服务，现已经拥有上千位计算机专业的老师，当然包括数据库作业代写，专业老师为您提供1对1辅导。
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下面是一例数据库代写高分实例，联系微信客服查看更多出分案例噢！
Question 1:
a) Why would a company choose not to implement all its tables in 3NF, but leave
some in 1NF or 2NF instead? Explain with an example.
b) A database is designed to help companies achieve central storage of data so as
to reduce data redundancy and improve data consistency. Why do companies
still create multiple databases?
c) What are the reasons for creating views using SQL? Explain how a view can be
used to reinforce data security?
d) List five potential benefits of the database approach compared to the
conventional file system approach.
e) Cloud computing is gaining wide acceptance in industry. It involves sharing hardware (e.g. IaaS: Infrastructure as a Service), system software (e.g., PaaS:Platform as a Service) and application software (e.g. SaaS: Software as a Service) on the cloud so as to create a win-win situation (an example of a shared economy) for both customers and software vendors. Please explain how Client/Server database architecture can fit into the cloud computing framework.
Question 2:
An Internet bank wishes to expand its business in the credit card area. Currently it supports customers with two types of card accounts: debit cards and credit cards. Credit card accounts accumulate charges with merchants. Each charge is about 3% of the transaction amount and is identified by the date and amount of the charge. A detailed EER diagram for its business expansion is shown in the figure below:
Answer the following questions (Note any unspecified requirements and make appropriate assumptions to make the specification complete).
a) Convert the above EER diagram into the relational schema.
b) Show all the functional dependencies that should hold among the attributes.
c) Design relation schemas for the database in 3NF. Specify the primary and foreign key attributes of each relation.
