Which of the following best describes a composite key?
A large enterprise uses a two-tier database architecture and runs complex database applications.Which term best describes the client in this system?
Consider the Recreation relation in the exhibit. A data operation that changes one of the tuples for Student_ID 1003 must be performed. It is necessary to change one of the activities from swimming to tennis. The Student_ID and Activity attributes make up the primary key for the Recreation relation. All related information must be altered, as well. Which SQL statement or statements would best accomplish this?
Which process is used to prevent the current database operation from reading or writing a data item while that data item is being accessed by another operation?
Your company must choose which type of database to use for a new project. Which of the following lists three characteristics of file-based database systems?
Consider the Project relation shown in the exhibit as well as the following SQL statement: Which of the following tables shows the Project relation after execution of this SQL statement?
