FROM HW1
Extra Credit 1
5.8.
Specify the following views in SQL on the COMPANY database schema
shown in Figure 3.5.
a. A view that has the department name, manager name, and manager
salary for every department.
b. A view that has the employee name, supervisor name, and employee
salary for each employee who works in the ‘Research’ department.
c. A view that has the project name, controlling department name, number
of employees, and total hours worked per week on the project for each
project.
d. A view that has the project name, controlling department name, number
of employees, and total hours worked per week on the project for each
project with more than one employee working on it.
15.28. Consider the relation R, which has attributes that hold schedules of courses
and sections at a university; R = {Course_no, Sec_no, Offering_dept,
Credit_hours, Course_level, Instructor_ssn, Semester, Year, Days_hours, Room_no,
No_of_students}. Suppose that the following functional dependencies hold
on R:
{Course_no} → {Offering_dept, Credit_hours, Course_level}
{Course_no, Sec_no, Semester, Year} → {Days_hours, Room_no,
No_of_students, Instructor_ssn}
{Room_no, Days_hours, Semester, Year} → {Instructor_ssn, Course_no,
Sec_no}
Try to determine which sets of attributes form keys of R. How would you
normalize this relation?
Consider the following relations for an order-processing application database
at ABC, Inc.
ORDER (O#, Odate, Cust#, Total_amount)
ORDER_ITEM(O#, I#, Qty_ordered, Total_price, Discount%)
all figures u need u will find in the book
Assume that each item has a different discount. The Total_price refers to one
item, Odate is the date on which the order was placed, and the Total_amount is
the amount of the order. If we apply a natural join on the relations
ORDER_ITEM and ORDER in this database, what does the resulting relation
schema look like? What will be its key? Show the FDs in this resulting relation.
Is it in 2NF? Is it in 3NF? Why or why not? (State assumptions, if you
make any.)
They have a magnificent team. These people are always kind and willing to listen to your concerns or issues. Better yet, your assignment is always ready before the time, they usually send you a draft to double-check before they finalize your paper.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.
Read moreEach paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.
Read moreThanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.
Read moreYour email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.
Read moreBy sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.
Read more