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NEW QUESTION 1
Consider the following relational algebraic expression as well as the Dept1_Parts and Dept2_Parts relations shown in the exhibit:
Which of the following relations would result from the given relational algebraic expression?
- A.
- B.
- C.
- D.
Answer: C
NEW QUESTION 2
Which area of database security involves maintaining access to enterprise data?
- A. Integrity
- B. Privacy
- C. Availability
- D. Confidentiality
Answer: C
NEW QUESTION 3
Consider the following relational algebraic expression:
Which of the following SQL statements is equivalent to this relational algebraic expression?
- A. SELECT Sales_Rep_No(108) FROM Orders;
- B. INSERT INTO OrdersVALUES(Sales_Rep_No = 108) WHERE Sales_Rep_No = NULL;
- C. SELECT *FROM OrdersWHERE Sales_Rep_No = 108;
- D. SELECT *FROM OrdersWHERE Sales_Rep_No = 108;
Answer: C
NEW QUESTION 4
Which of the following occurs in a relation when records are added or removed?
- A. The number of domains changes.
- B. The attributes in the table change.
- C. The cardinality of the relation is fixed but the degree varies.
- D. The degree of the relation is fixed but the cardinality varies.
Answer: D
NEW QUESTION 5
Which security technique limits access by unauthorized users to parts of an enterprise database?
- A. Views
- B. Concurrency
- C. Locking
- D. Integrity controls
Answer: A
NEW QUESTION 6
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_IDFROM Dept2_Parts);
- B. SELECT *FROM Dept1_Parts MINUS(SELECT Part_IDFROM Dept2_Parts);
- C. SELECT *FROM Dept1_Parts DIFFERENCE (SELECT Part_IDFROM Dept2_Parts);
- D. SELECT *FROM Dept1_Parts DIFFERENCE (SELECT Part_IDFROM Dept2_Parts);
Answer: D
NEW QUESTION 7
The database manager wants to give Rubio and Doe the ability to modify the Project Relation shown in the exhibit. A temporary employee named Temp needs to access the data in the database to generate reports. Which group of SQL statements will perform this task?
- A. Mastered
- B. Not Mastered
Answer: A
NEW QUESTION 8
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?
- A. Repetition of data, application program flexibility, and data centralization
- B. Incompatibility of files, tabular data structures, and data dependence
- C. Separation of data, repetition of data, and data independence
- D. Application program inflexibility, data dependence, and separation of data
Answer: D
NEW QUESTION 9
The exhibit shows a relation for a companys projects. Which candidate key(s) would best serve as the primary key for this relation?
- A. S_Date and E_Date
- B. Proj_ID
- C. Item_Num and E_Date
- D. Proj_ID and Item_Num
Answer: D
NEW QUESTION 10
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
NEW QUESTION 11
Your enterprise has reached the conceptual design phase for a database project. What is the desired goal at the end of this design phase?
- A. A set of normalized relations
- B. A reviewed entity-relationship (ER) model
- C. An entity-relationship (ER) model with no redundant data
- D. A set of denormalized relations
Answer: B
NEW QUESTION 12
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.
Answer: B
NEW QUESTION 13
Which type of relational integrity is violated if a primary key in a database has a null value?
- A. Entity integrity
- B. Domain integrity
- C. Domain constraints
- D. Referential integrity
Answer: A
NEW QUESTION 14
Which term best describes one or more database operations that are executed as a single unit?
- A. Update
- B. Transaction
- C. Procedure
- D. Singleton
Answer: B
NEW QUESTION 15
Consider the entity-relation (ER) diagram shown in the exhibit. When the logical database design phase is completed, which of the following is a valid DBDL description of the base relations for the ER diagram?
- A. STUDENT(Student_Number: integer NOT NULLName: variable length character string length 20 NOT NULL) Primary Key Student_NumberCLASS(Class_Num: integer NOT NULL Class_Name: integer NOT NULL) Primary Key Class_Num
- B. STUDENT(Student_Number: integer NOT NULLName: variable length character string length 20 NOT NULL) Primary Key Student_NumberCLASS(Class_Num: integer NOT NULL Class_Name: integer NOT NULL) Primary Key Class_NumForeign Key Class_Num References STUDENT
- C. STUDENT(Student_Number: integer NOT NULLName: variable length character string length 20 NOT NULL) Primary Key Student_NumberSTU_CLASS(Student_Number: integer NOT NULL Class_Num: integer NOT NULL) Primary Key Student_Number CLASS(Class_Num: integer NOT NULL Class_Name: integer NOT NULL) Primary Key Class_Num
- D. STUDENT(Student_Number: integer NOT NULLName: variable length character string length 20 NOT NULL) Primary Key Student_NumberSTU_CLASS(Student_Number: integer NOT NULL Class_Num: integer NOT NULL) Primary Key Student_Number CLASS(Class_Num: integer NOT NULL Class_Name: integer NOT NULL) Primary Key Class_Num
Answer: D
NEW QUESTION 16
Consider the Information Engineering diagram shown in the exhibit for a building management company. Referential integrity must be maintained such that a building cannot be deleted when it has residents. Building_ID, R_ID, Room_Count and Room_Num are integer numbers, whereas Bldg_Name, Location and Res_Name are all represented by variable-length strings with a maximum of 20 characters. Which SQL statement best implements the relations shown in this diagram?
- A. CREATE TABLE BUILDING (Building_ID INTEGER NOT NULL PRIMARY KEY,Bldg_Name VARCHAR (20),Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY,Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL,FOREIGN KEY Building_ID REFERENCES RESIDENT (Building_ID) ON DELETE NO CHECK);
- B. CREATE TABLE BUILDING (Building_ID INTEGER NOT NULL PRIMARY KEY,Bldg_Name VARCHAR (20),Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY,Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL,FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID) ON DELETE NO CHECKON UPDATE CASCADE);
- C. CREATE TABLE BUILDING (Building_ID INTEGER NOT NULL PRIMARY KEY,Bldg_Name VARCHAR (20),Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY,Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL,FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID) ON DELETE NO CHECKON UPDATE CASCADE);
- D. CREATE TABLE BUILDING (Building_ID INTEGER NOT NULL PRIMARY KEY,Bldg_Name VARCHAR (20),Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY,Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL,FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID) ON DELETE NO CHECKON UPDATE CASCADE);
Answer: C
NEW QUESTION 17
What is the highest normal form of the relation(s) shown in the exhibit?
- A. Mastered
- B. Not Mastered
Answer: A
NEW QUESTION 18
Your enterprise has created a database and database application. The testing phase for the project has started. Which of the following best describes white-box testing of the projects software?
- A. The database designer tests the software because he or she is able to make necessary changes to the underlying code for the software.
- B. A user who has no knowledge of the softwares underlying code tests the software.
- C. Someone other than the database designer tests the softwar
- D. This person has no access to the underlying code and attempts to use thesoftware only in ways not considered by the software designers.
- E. A person tests the software and submits suggestions to the software's underlying code.This person is someone other than the databasedesigner, but has access to the softwares underlying code.
Answer: D
Explanation:
NEW QUESTION 19
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