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Consider the following BCNF relations, which describe departments in a company and employees:
Dept(did, dname, location, managerid) Emp(eid, sal)
You are told that the following queries are extremely important:
List the names and ids of managers for each department in a user-speci?ed loca-tion, in alphabetical order by department name.
Find the average salary of employees who manage departments in a user-speci?ed location. You can assume that no one manages more than one department.
1. Describe the ?le structures and indexes that you would choose.
2. You subsequently realize that updates to these relations are frequent. Because indexes incur a high overhead, can you think of a way to improve performance on these queries without using indexes?
Sketch a DFSA for identifiers which contain only letters and digits, where identifier should have at least one letter, but it need not be first character.
When a student has not chosen a major at a university, the university often enters a value of "Undecided" for the major field. Is "Undecided" a way to represent the null value? Should it be used as a default value? Justify your answer carefully.
The array was the first example of a structured data type that can hold multiple values. The structure is the second example
A small business with 100 computer workstations is installing a new local area network. All of the users perform the usual operations of e-mail. State your reasoning. Draw a floor plan for each If possible, show both floor plans on one page.
write a two-page executive summary for your boss explaining how a relational data solution can be applied to a current
Explain the following terms brie?y: attribute, domain, entity, relation-ship, entity set, relationship set, one-to-many relationship, many-to-many relationship, participation constraint, overlap constraint, covering constraint, weak entity set, aggre..
Create a function that returns the day of the week for a specified date. Create a trigger that displays the message "Emp table updated" when an update to the employee table increases the employee's basic salary.
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.
Discuss security threats as it relate to the Operating Systems and Memory Management. Consider a fixed partitioning scheme with equal-size partitions of 2 16 bytes and a total main memory size of 2^24 bytes. A process table is maintained that inc..
Entity relationship model is in wide use as a design tool for relational databases. Why do you think designers have chosen this model, and what makes it an effective design tool?
In a "chosen ciphertext attack" the attacker has the option of choosing the ciphertext sample and having it decrypted by someone who knows the key. Wouldn't this result in pure gibberish most of the time?
Draw an inheritance hierarchy to represent a shoe object. The base class should have derived classes of Dress Shoes, Tennis Shoes and Boots.
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