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Q33. Which of the following describes two desirable characteristics of a primary key?
A. A primary key should be a value that may be null and may change over time.
B. A primary key should be a value that is not null and will never change.
C. A primary key should consist of meaningful data and a value that can be changed if needed.
D. A primary key should not consist of meaningful data and a value that can be changed if needed.
Q34. Which subset of Structured Query Language (SQL) is used to perform operations such as data retrieval or deletion on the data contained in a database?
A. Data Control Language
B. Data Definition Language
C. Data Formatting Language
D. Data Manipulation Language
Q35. In a relational database, which term describes a single table consisting of rows and columns?
D. Data dictionary
Q36. Consider the relation shown in the exhibit. Which of the following SQL statements would properly add information for a new employee?
A. INSERT INTO Employee VALUES(0005, Tim, Bogart, 03-15-77);
B. INSERT INTOEmployee(Emp_ID, First_Name, Last_Name, Birth_Date) VALUES(0004, Tim, Bogart, 03-15-77);
C. INSERT INTOEmployee(Emp_ID, First_Name, Last_Name, Birth_Date) VALUES(0005, Tim, Bogart, 03-05-77);
D. INSERT INTOEmployee(Emp_ID, First_Name, Last_Name, Birth_Date) VALUES(0005, Tim, Bogart, 03-05-77);
Q37. Consider the following relational algebraic expression as well as the Employee and Department relations shown in the exhibit: Which of the following relations would result from the given relational algebraic expression?
Q38. Several SQL operations are performed by User 1 to access the Fee information for Bowling in the Act_Fee relation (shown in the exhibit). The first access returns a fee of 50. An unrelated SQL operation by another user updates the Bowling fee to 60. The second access by User 1 returns a fee of 60. What problem has occurred?
C. Dirty read
D. No problem has occurred.
Q39. Consider the Dept1_Parts and Dept2_Parts relations shown in the exhibit. Which of the following SQL statements would create a set difference of the two relations with the widest variety of Structured Query Language dialects?
A. SELECT * FROM Dept1_Parts EXCEPT (SELECT Part_ID FROM Dept2_Parts);
B. SELECT * FROM Dept1_Parts MINUS (SELECT Part_ID FROM Dept2_Parts);
C. SELECT * FROM Dept1_Parts DIFFERENCE (SELECT Part_ID FROM Dept2_Parts);
D. SELECT * FROM Dept1_Parts DIFFERENCE (SELECT Part_ID FROM Dept2_Parts);
Q40. Your enterprise is creating a relation (shown in the exhibit) that tracks parts and suppliers. Which situation would occur if new supplier information were entered in the relation before any information about specific parts?
A. An update anomaly and an insertion anomaly would occur.
B. An insertion anomaly would occur.
C. A deletion anomaly would occur.
D. A deletion anomaly and an update anomaly would occur.