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1. Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
2. Code an Oracle Database trigger to allow the deletion of a department if it only has one employee. Assign the last employee to the Human Resources department.
3. Design a system of triggers to enforce the M-M relationship.
4. as an example, but assume that departments with only one employee can be deleted. Assign the last employee in a department to Human Resources.
creating database structure using SQL
What is the two-phase locking protocol and what is the strict two-phase locking protocol? What is the rigorous two-phase locking protocol? What benefit does strict two-phase locking protocol provide? What benefit does rigorous two-phase locking pr..
Find the average number of books borrowed per member. Take into account that if a member does not borrow any books, then that member does not appear in the borrowed relation at all.
Why do you believe that views by themselves are insufficient for protecting access by unauthorized users?
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.
Design the Update trigger on Part table which raises an error string if Count field of updated row has a higher value than value prior to Update.
Design a database for Ray. For each director, list his or her number and name and the year he or she was born. If the director is deceased, list the year of death.
You are interested in analyzing some hard-to-obtain data from two separate databases. Each database contains n numerical values.
You have just received a new computer at work. it runs fast and works great. thinking about the future and the day something might break explain why it is important to record this information.
Pharmacy systems today are more efficient and user friendly when compared to the systems 20 years ago.
Input names of students from user, terminated by ZZZ, and design the data file GRADES with records of form: student (string), test1 (integer), test2 (integer), test3 (integer).
What is Recovering a database via rollforward? What is aim of transaction log? What is contained in transaction log?
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