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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 must store the locations through which the package has gone. For each location, the database needs to store the location ID, the city name and the country name. For each package, the database must store 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.
Describe the information seen, using the terms such as table, schema and key. Describe the EMPLOYEE and EMP_PHOTO tables in detail.
List the courses (D-code and C-no), along with the names of the students who are currently taking them. List all the courses (D-code and C-no) that John (i.e., S-Name=''John'') got 'A' grade.
Developers have noticed that EMP table doesn't have an assigned primary key. EMP_ID column has been selected to be the primary key.
Illustrate relational algebra expressions for names of all salespeople, names of all salespeople having ORDER row and names of salespeople not having ORDER row.
List the names of agents that placed an order for customer C003 or customer C006. List all pair of products names that are in the same city, along with their city name.
Transform the tables into one or more tables in BCNF. State the primary keys, candidate keys, and referential integrity constraints.
You have probably seen that already when you tried to create an E-R diagram. Visio uses notation and graphical shapes that are not the same as those in your text. If you look at some of the links to schemas, you will see a similar sort of thing.
Compute a canonical cover for the above set of functional dependencies (show each step of your derivation with an explanation).
Input names of students from the user, terminated by ZZZ, and create a data file GRADES with records of the form.
Write an SQL query to get the author of the book "The Alchemist"
Draw an ER diagram for database scenario. Design a set of 3NF tables for your database scenario.
Explain how much the modulating signal power is required to generate 100 percent modulation? What is the approximate center frequency of filter required to pass the lower sideband?
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