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Q51. Which pair of relational algebraic operations requires union compatibility?
A. Union and join
B. Selection and projection
C. Intersection and difference
D. Cartesian product and intersection
Answer: C
Q52. Consider the Dept1_Parts and Dept2_Parts relations shown in the exhibit. Which of the following SQL statements would create an intersection of the two relations with the widest variety of Structured Query Language dialects?
A. SELECT *
FROM Dept1_Parts
AND
(SELECT *
FROM Dept2_Parts);
B. SELECT *
FROM Dept1_Parts
INTERSECTION
(SELECT *
FROM Dept2_Parts);
C. SELECT *
FROM Dept1_Parts
WHERE Dept1_Parts.Part_ID = Dept2_Parts.Part_ID;
D. SELECT *
FROM Dept1_Parts
WHERE Dept1_Parts.Part_ID = Dept2_Parts.Part_ID;
Answer: D
Q53. The exhibit shows a table called Activity Relation that relates a unique student identification number with a sports activity and a fee for participating in that activity. A student can participate in only one activity. The key for the relation is Student_ID. What consequence would occur if the tuple for Student_ID 1001 were removed?
A. An update anomaly would occur.
B. An insertion anomaly would occur.
C. A deletion anomaly would occur.
D. Both an insertion anomaly and a deletion anomaly would occur.
Answer: C
Q54. In a relational database, which term describes a single table consisting of rows and columns?
A. Entity
B. Matrix
C. Relation
D. Data dictionary
Answer: C
Q55. Which term describes the rejoining of relations that have been decomposed?
A. Normalization
B. Denormalization
C. Referential integrity
D. Domain constraints
Answer: B
Q56. The exhibit shows a table called Housing Relation that relates a unique student identification number with a dormitory building and a room fee for that building. Each building charges only one fee and a student can live in only one building. The key for the Housing Relation is Student_ID.
This table is in which normal form?
A. S_Date and E_Date
B. ProjJD
C. ltem_Num and E_Date
D. Proj_ID and Item_Num
Answer: D
Q57. Which of the following best describes the two-tier database architecture?
A. The user accesses a database server using a terminal.
B. The user interface, data-processing logic, database access and data validation functions are performed on a mainframe server.
C. The user interface and data validation functions are performed by the client whereas the data-processing logic is performed on a server.
D. The user interface and data-processing logic are performed by the client whereas the server handles database access and data validation functions.
Answer: D
Q58. Which term describes an attribute or combination of attributes that uniquely identifies a row in a relation?
A. Entity
B. Domain
C. Primary key
D. Attribute group
Answer: C
Q59. Consider the relations shown in the exhibit. Which of the following SQL statements would enter data from the Customers relation into the Atlanta_Customers relation?
A. INSERT INTOAtlanta_Customers VALUES( SELECT * FROM
Customer s WHERE Sales_Office = Atlanta
B. INSERT INTOAtlanta_Customers SELECT * FROM Customers WHERE Sales_Office = Atlanta
C. INSERT INTOAtlanta_Customers SELECT Cust_No, Cust_Name, Satisfaction_Rate, Sales_Rep_No FROM Customers WHERE Sales_Office = Atlanta
D. INSERT INTOAtlanta_Customers SELECT Cust_No, Cust_Name, Sales_Office, Sales_Rep_No FROM Customers WHERE Sales_Office = Atlanta
Answer: C
Q60. Your enterprise must decide whether to use a database management system. Which of the following best describes the functionality of a DBMS?
A. A DBMS provides the ability to control data access and limit the number of users at one time.
B. A DBMS provides the ability to maintain databases while providing increased security for the database.
C. A DBMS allows users to access the database while allowing the database administrator to define views particular to individual sets of users.
D. A DBMS provides the ability to define, create and maintain databases while providing controlled access to databases.
Answer: D