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NEW QUESTION 1
Which term best defines a database system in which data records are stored with no structured relationships between the records?
- A. Flat-file database
- B. Relational database
- C. Distributed database
- D. Object-oriented database
Answer: A
NEW QUESTION 2
What is a domain?
- A. A normalized set of data applicable to a particular relation
- B. A combination of attributes for a relation
- C. A definition of permissible values for one or more attributes
- D. A set of permissible values for one or more relations
Answer: C
NEW QUESTION 3
Which of the following ACID properties requires that a transaction be executed in its entirety or not all?
- A. Durability
- B. Consistency
- C. Isolation
- D. Atomicity
Answer: D
NEW QUESTION 4
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_Number
CLASS(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 5
Consider the Registration relation shown in the exhibit. Which of the following SQL statements would return all tuples that have course codes beginning with the letter M?
- A. SELECT *FROM RegistrationWHERE Course_Code = M#;
- B. SELECT *FROM RegistrationWHERE Course_Code LIKE M_;
- C. SELECT *FROM RegistrationWHERE Course_Code LIKE M%;
- D. SELECT *FROM RegistrationWHERE Course_Code = M%;
Answer: C
NEW QUESTION 6
Which term describes the rejoining of relations that have been decomposed?
- A. Mastered
- B. Not Mastered
Answer: A
NEW QUESTION 7
Consider the following relation definitions:
STUDENT(
Student_Number: integer NOT NULL
Name: variable length character string length 20 ) Primary Key Student_Number
HOUSING(
Housing_ID: integer NOT NULL Student_Number: integer NOT NULL
Building: variable length character string length 25 ) Primary Key Housing_ID
Foreign Key Student_Number References STUDENT(Student_Number) ON DELETE NO ACTION
ON UPDATE CASCADE
What are the referential constraints for the relations defined in these relation definitions?
- A. There is no relationship between changes in STUDENT(Student_Number) and HOUSING(Student_Number).
- B. When STUDENT(Student_Number) is changed or deleted, this modification or deletion will automatically be reflected inHOUSING(Student_Number).
- C. Modifications to HOUSING(Student_Number) are automatically reflected in changes to STUDENT(Student_Number), but deletions are notpermitted.
- D. Modifications to STUDENT(Student_Number) are automatically reflected in changes to HOUSING(Student_Number). For a deletion to occurfrom STUDENT(Student_Number), it must first occur in HOUSING(Student_Number).
Answer: D
NEW QUESTION 8
Which three pieces of information did E.F. Codd describe as necessary to retrieve a data value from a relational database?
- A. Mastered
- B. Not Mastered
Answer: A
NEW QUESTION 9
Consider the Registration relation shown in the exhibit. Which of the following SQL statements would return the Registration2 relation from the Registration relation?
- A. SELECT Course_Code FROM Registration;
- B. SELECT *FROM RegistrationWHERE Registration_ID = 1003 AND Registration_ID = 1005;
- C. SELECT *FROM RegistrationWHERE Course_Code = 'A4343';
- D. SELECT Registration_ID, Student_ID, First_Name, Last_Name
FROM RegistrationWHERE Course_Code = 'A4343';
Answer: C
NEW QUESTION 10
Which of the following best describes the ON DELETE CASCADE referential integrity constraint?
- A. If a parent key is deleted, any child keys referenced by the parent key are automatically deleted.
- B. If any child key references a parent key, the record containing the parent key cannot be deleted.
- C. If a parent key is deleted, all child keys are automatically set to a specified value.
- D. If a parent key is deleted, no test is made for referential integrity.
Answer: A
NEW QUESTION 11
Consider the Orders relation shown in the exhibit. Which of the following SQL statements would return all complete tuples for order dates in 2002, arranged by amount from lowest to highest?
- A. SELECT *FROM OrdersWHERE Order_Date LIKE _02 ORDER BY Amount;
- B. SELECT (Order_Date, Amount) FROM OrdersWHERE Order_Date LIKE %02 ORDER BY Amount;
- C. SELECT *FROM OrdersWHERE Order_Date LIKE _02 ORDER BY Order_No;
- D. SELECT *FROM OrdersWHERE Order_Date LIKE %02 ORDER BY Amount;
Answer: D
NEW QUESTION 12
Which type of dependency occurs when one attribute of a composite primary key is removed and the dependency still exists?
- A. 1:1
- B. Transitive
- C. Functional
- D. Partial functional
Answer: D
Explanation:
NEW QUESTION 13
The exhibit shows a table called Student Relation that tracks all information related to a students courses, professors and sites. What would be the consequence of removing all records for a student with the ID 1311?
- A. Only an update anomaly would occur.
- B. An insertion anomaly would occur.
- C. A deletion anomaly would occur.
- D. An update anomaly and a deletion anomaly would occur.
Answer: C
NEW QUESTION 14
Consider the following relation definition:
STUDENT(
Student_Number: integer NOT NULL
Name: variable length character string length 20 NOT NULL) Primary Key Student_Number
HOUSING(
Housing_ID: integer NOT NULL Student_Number: integer NOT NULL
Building: variable length character string length 25 NOT NULL) Primary Key Housing_ID
Foreign Key Student_Number References STUDENT(Student_Number)
ON DELETE NO CHECK ON UPDATE
Which integrity constraint is violated in this relation definition?
- A. Entity integrity
- B. Domain constraint
- C. Referential integrity
- D. Enterprise constraint
Answer: C
NEW QUESTION 15
Which of the following best describes the information contained in the data dictionary (or system catalog)?
- A. Metadata
- B. Data model
- C. Table data
- D. Metafile
Answer: A
NEW QUESTION 16
Which statement is used to define a named group of related tables, views, domains and other database objects?
- A. CREATE ENTITY
- B. CREATE INDEX
- C. CREATE DOMAIN
- D. CREATE SCHEMA
Answer: D
NEW QUESTION 17
To create a view, what are the minimal privileges that a user must have for the relations used to make the view?
- A. GRANT
- B. REVOKE
- C. SELECT
- D. CREATE VIEW
Answer: C
NEW QUESTION 18
Consider the Stu_Act and Act_Fee tables shown in the exhibit. Which relational algebraic operation would yield the Activity Relation table in the exhibit?
- A. Union
- B. Intersection
- C. Natural join
- D. Cartesian product
Answer: C
NEW QUESTION 19
......
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