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October 24, 2017

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Q1. 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); 

Answer:


Q2. Which concurrency control method should be used only when conflicts between transactions rarely occur? 

A. Locking 

B. Time stamps 

C. Optimistic 

D. Serialization 

Answer:


Q3. Your database administrator has disallowed a group of users from making alterations to the Employees table in your corporate database. The users, known as Group_2, previously had full privileges with the Employees table. Which of the following SQL statements properly removes any alteration privileges from Group_2? 

A. REVOKE INSERT, UPDATE, DELETE ON Employees FROM Group_2; 

B. REVOKE UPDATE FOR Employees FROM Group_2; 

C. REVOKE INSERT, UPDATE, DELETE ON Employees FOR Group_2; 

D. REVOKE UPDATE, DELETE FOR Employees FROM Group_2; 

Answer:


Q4. 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:


Q5. Consider the following SQL statement and the Orders relation shown in the exhibit: 

What is the output of this SQL statement? 

SELECT * 

FROM Orders 

WHERE NOT (Amount < 1000 

AND Sales_Rep_No = 210); 

A. A 

B. B 

C. C 

D. D 

Answer:


Q6. What is the highest normal form of the relation(s) shown in the exhibit? 

What is the highest normal form of the relation(s) shown in the exhibit? 

A. Boyce-Codd normal form 

B. First normal form 

C. Second normal form 

D. Third normal form 

Answer:


Q7. Using the Customer and Sales_Rep relations shown in the exhibit, you must determine a relational algebraic expression that will result in the following relation: Which of the following relational algebraic expressions would result in this relation? Using the Customer and Sales_Rep relations shown in the exhibit, you must determine a relational algebraic expression that will result in the following relation: Which of the following relational algebraic expressions would result in this relation? 

A. Customer X Sales_Rep 

B. (Sales_Rep.Sales_Rep_No = Customer.Sales_Rep_No (Sales_Rep X Customer)) 

C. (Customer X Sales_Rep) ? Sales_Rep.Sales_Rep_No = Customer.Sales_Rep_No 

D. Customer.Sales_Rep_No = Sales.sales_Rep_No (Customer X Sales_Rep) 

Answer:


Q8. 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? 

B. An insertion anomaly would occur. 

C. A deletion anomaly would occur. 

D. An update anomaly and a deletion anomaly would occur. 

Answer:


Q9. Consider the following DBDL description of an entity: Teachers (teach_num: variable length character string length 10 NOT NULL teach_name: variable length character string length 10 NOT NULL) Primary Key: teach_num which integrity constraint is satisfied? 

A. Entity integrity 

B. Necessary data 

C. Referential integrity 

D. Referential foreign integrity 

Answer:


Q10. 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 domain 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:



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