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We want to construct a database for a world-wide package delivery company (e.g., DHL). The database must be able to keep track of customers who ship items and customers who receive items (some customers may do both). For each customer, the database needs
to store the customer ID, name and address. Each package must be trackable, so the database muststore the locations through which the package has gone. For each location, the database needs tostore the location ID, the city name and the country name. For each package, the database muststore the package ID and the weight.
(a) Draw an E-R diagram that reflects the above reuirements.
(b) Define a set of relational schemas and identify primary and foreign keys. Try not to include redundant schemas.
What is the maximum rate at which data can be read from disk, assuming that we can only read data from one surface at a time? What is the average rotational latency?
Write a SELECT statement that returns three columns: InvoiceTotal From the Invoices table, 10% 10% of the value of InvoiceTotal.
Use the three-sphere model for systems management and brainstorm issues related to the change based on the business, technology, and organization spheres.
What criteria would you use in selecting a life-cycle model for the project?
Draw an ER diagram for your database scenario. Design a set of 3NF tables for your database scenario.
Mark the following words in the document as index entries: behavior (four instances), favorable (five instances), and impression (eight instances).
What actions does a referential integrity constraint prevent from occurring when data is inserted in a table that contains this constraint?
List the students ID, name, GPA, and course Number such that all students have GPA greater than 3 . 5 and enrolled in a course in Jan 1, 2011. Find the names of all students who have GPA greater than 3.
Is software measurement equivalent to software metrics? What makes them different?
Write the application for university admissions office. Prompt user for a student's High School Grade Point and an admission test score.
Describe the difference ways of implementing one-to-one relationships. Assume you are maintaining information on offices (office numbers, building, and phone numbers)
Explain the content of this document in natural language;Design the graph representation of document;
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