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NEW QUESTION 1
Consider the symbols shown in the exhibit. Which of the following correctly identifies these symbols when used in an entity-relationship (ER) diagram?
- A. 1 = attribute, 2 = entity, 3 = relationship
- B. 1 = entity, 2 = relationship, 3 = attribute
- C. 1 = relationship, 2 = entity, 3 = attribute
- D. 1 = relationship, 2 = attribute, 3 = entity
Answer: C
NEW QUESTION 2
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 3
Consider the entity-relationship (ER) diagram shown in the exhibit. Which type of relationship between the two entities is shown?
- A. m:m
- B. m:n
- C. 1:1
- D. 1:n
Answer: B
NEW QUESTION 4
Consider the Orders relation shown in the exhibit. Which of the following SQL statements would replace the value in the Sales_Rep_No column with 110 everywhere that Sales_Rep_No 108 is listed?
- A.
UPDATE Sales_Rep_No IN Orders SET(Sales_Rep_No = 110WHERE Sales_Rep_No = 108); - B. UPDATE OrdersSET Sales_Rep_No = 110 WHERE Sales_Rep_No = 108;
- C. UPDATE OrdersSET Sales_Rep_No = 110;
- D. UPDATE OrdersWHERE Sales_Rep_No = 108 SET Sales_Rep_No = 110;
Answer: B
NEW QUESTION 5
A relation for a construction company is shown in the exhibit. Which of the following best defines the relationship between Cust_ID and Cust_Name?
- A. Cust_Name is the determinant.
- B. Cust_Name is transitively dependent on Cust_ID.
- C. Cust_ID is transitively dependent on Cust_Name.
- D. Cust_Name is functionally dependent on Cust_ID.
Answer: D
NEW QUESTION 6
The exhibit shows a table called Housing Relation. This table relates a unique student identification number with a dormitory building and a room fee for that building. The key for the Housing Relation is Student_ID. If each building charges only one fee and a student can live in only one building, then this table is in which normal form?
- A. 1NF
- B. 1NF and 2NF
- C. 1NF, 2NF, and 3NF
- D. 1NF, 2NF, 3NF, and BCNF
Answer: B
NEW QUESTION 7
Which concurrency control method should be used only when conflicts between transactions rarely occur?
- A. Locking
- B. Time stamps
- C. Optimistic
- D. Serialization
Answer: C
NEW QUESTION 8
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 9
What is the highest normal form of the relation(s) shown in the exhibit?
- A. Mastered
- B. Not Mastered
Answer: A
NEW QUESTION 10
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 11
Consider the relation shown in the exhibit. Which of the following SQL statements would return a relation that excludes all customers with a Satisfaction_Rate of less than or equal to 80 unless the Sales_Office is located in Atlanta?
- A. SELECT *
FROM CustomersWHERE Satisfaction_Rate > 80 OR Sales_Office = Atlanta; - B. SELECT *FROM CustomersWHERE Satisfaction_Rate <= 80 AND Sales_Office = Atlanta;
- C. SELECT *FROM CustomersWHERE Satisfaction_Rate >= 80;
- D. SELECT *FROM CustomersWHERE Satisfaction_Rate >= 80 AND NOT Sales_Office = Atlanta;
Answer: A
NEW QUESTION 12Consider 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 13
A theta-join can be viewed as:
- A. the intersection of two relations.
- B. a Cartesian product of two relations.
- C. a restricted Cartesian product of two relations.
- D. the Cartesian product of two union-compatible relations.
Answer: C
NEW QUESTION 14
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 15
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 16
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