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Code d'Examen: 1Z0-870
Nom d'Examen: MYSQL (MySQL 5.0, 5.1 and 5.5 Certified Associate Exam)
Questions et réponses: 240 Q&As
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NO.1 You work as a Database Administrator for Pass4sure.com. The company uses the MySQL database.
You have created a new table named Employees in the database and performed update operation but
you got an error because of the last transaction. Now, you want to terminate the last transaction. Which of
the following commands can you use to accomplish the task?
Each correct answer represents a complete solution. Choose all that apply.
A. ROLLBACK
B. REMOVE
C. DELETE
D. COMMIT
Answer: A,D
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NO.2 You work as a Database Administrator for Pass4sure.com. The company uses MySQL as its database.
You have written two statements, which are as follows:
1. SELECT DISTINCT OBJECT_TYPE
FROM USER_OBJECTS;
2. SELECT OBJECT_TYPE
FROM ALL_OBJECTS;
Which of the following options explains the difference between the results of these two
statements? Each correct answer represents a complete solution. Choose all that apply.
A. The first statement will display distinct object types that can be accessed by the user.
B. The second statement will display all object types that a user can access.
C. The first statement will display distinct object types owned by a user.
D. The second statement will display all object types owned by a user.
Answer: B,C
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NO.3 Which of the following statements is correct for equijoin used to join two tables named Employees and
Department?
A. SELECT Dept_Name, Emp_Name
FROM Departments d1, Employees e1
ORDER BY Dept_Name, Emp_Name;
B. SELECT D.Dept_Name, E.Emp_Name
FROM Departments d1, Employees e1
HAVING Dept_Name, Emp_Name;
C. SELECT E.Emp_Name, D.Dept_Name
FROM Departments d1, Employees e1
WHERE Dept_No = Dept_No
ORDER BY Dept_Name, Emp_Name;
D. SELECT Dept_Name, Emp_Name
FROM Departments d1, Employees e1
WHERE d1.Dept_No = e1.Dept_No
ORDER BY Dept_Name, Emp_Name;
Answer: D
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NO.4 Which of the following are true about UPDATE statements?
Each correct answer represents a complete solution. Choose all that apply.
A. You can use the WHERE clause to have your update affects a specific set of rows.
B. You use the SET clause to update multiple columns of a table separated by commas.
C. You can use co-related sub query in UPDATE statements to update data from other tables.
D. If you don't use the WHERE clause then the UPDATE will not update any rows in the table.
Answer: A,B,C
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NO.5 Adam works as a Database Administrator for Pass4sure.com. The company uses MySQL as its
database. Adam has created a table named Employees in the database. He wants to retrieve the
information of those employees who have at least one person reporting to them. Which of the following
queries will Adam execute to accomplish the task?
A. SELECT employee_id, last_name, job_id, department_id FROM Employees WHERE
employee_id EXISTS (SELECT manager_id WHERE manager_id is NULL);
B. SELECT employee_id, last_name, job_id, department_id FROM Employees HAVING
employee_id IN (SELECT manager_id FROM Employees WHERE manager_id is NOT NULL);
C. SELECT employee_id, last_name, job_id, department_id FROM Employees outer WHERE EXISTS
(SELECT 'x' FROM Employees WHERE manager_id = outer.employee_id);
D. SELECT employee_id, last_name, job_id, department_id FROM Employees WHERE
employee_id IN (SELECT manager_id WHERE manager_id is NOT NULL);
Answer: C
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NO.6 Which of the following will be true about a table column if you plan to create an index on that column?
Each correct answer represents a complete solution. Choose all that apply.
A. The column is often used in the WHERE clause of SQL statements.
B. The column contains very small number of NULL values.
C. The table is updated frequently.
D. The column should contain a wide range of values.
Answer: A,D
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NO.7 You work as a Database Administrator for Pass4sure.com. The company uses MySQL as its database
development platform. You have created a table named Employees in the database.
You want to display the names of the employees whose salary is more than $5000, but you do not want to
display any duplicate content. Therefore, you have written the following query:
SELECT emp_id, DISTINCT emp_name WHERE salary > 5000
FROM Employees;
Which of the following statements is true about the above query?
A. The statement will display only unique names whose salary is more than $5000.
B. The UNIQUE clause should be used in place of the DISTINCT clause.
C. The statement will give an error.
D. The statement will display those records whose salary is more than $5000.
Answer: C
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NO.8 Adam works as a Database Administrator for Pass4sure.com. He creates a table named Students.
He wants to create a new table named Class with the help of the Students table. Which of the following
syntaxes will Adam use to accomplish the task?
A. CREATE TABLE Class
INSERT INTO SELECT * FROM Students;
B. CREATE TABLE Class
FROM SELECT * FROM Students;
C. CREATE TABLE Class
(SELECT * FROM Students);
D. CREATE TABLE Class
AS SELECT * FROM Students;
Answer: D
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