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2014年4月5日星期六

1Z0-874 1Z0-873 1Z0-872 1Z0-871 1Z0-870 dernières questions d'examen certification MYSQL et réponses publiés

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Code d'Examen: 1Z0-874
Nom d'Examen: MYSQL (MySQL 5.0 Database Administrator Certified Professional Exam, Part II)
Questions et réponses: 140 Q&As

Code d'Examen: 1Z0-873
Nom d'Examen: MYSQL (MySQL 5.0 Database Administrator Certified Professional Exam, Part I)
Questions et réponses: 139 Q&As

Code d'Examen: 1Z0-872
Nom d'Examen: MYSQL (MySQL 5.0 Developer Certified Professional Exam, Part II)
Questions et réponses: 70 Q&As

Code d'Examen: 1Z0-871
Nom d'Examen: MYSQL (MySQL 5.0 Developer Certified Professional Exam, Part I)
Questions et réponses: 69 Q&As

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 For maximum efficiency in join operations of one column from each of two tables, which of the following
statements regarding indexes are true?
A. In a LEFT JOIN such as table1 LEFT JOIN table2 ON table1 .a = table2.b, the column b in table2
should always be indexed
B. A LEFT JOIN would not benefit from either of the participating columns being indexed
C. In an INNER JOIN, either, but not both, columns participating in the join should be indexed
D. In an INNER JOIN, both columns participating in the join should be indexed
E. An INNER JOIN would not benefit from either of the participating columns being indexed F. In a LEFT
JOIN such as table 1 LEFT JOIN table2 ON table 1 .a = table2.b, the column a in table 1should always be
indexed
Answer: A,D

MYSQL examen   1Z0-872   1Z0-872 examen

NO.2 Which of the following statements are true?
A. The MylSAM storage engine should be preferred when you expect many reads and few updates to
occur
B. The MylSAM storage engine should be preferred when you expect a mix of many reads and many
updates to occur
C. The InnoDB storage engine should be preferred when you expect many reads and few updates to
occur
D. The InnoDB storage engine should be preferred when you expect a mix of many reads and many
updates to occur
Answer: A,D

MYSQL   certification 1Z0-872   certification 1Z0-872   1Z0-872

NO.3 When executing multi-row operations, what should be the first thing you look for to see if anything
unexpected happened?
A. Warning/Error Count.
B. Warning/Error Codes.
C. Warning/Error messages.
Answer: A

MYSQL   1Z0-872   certification 1Z0-872   1Z0-872

NO.4 Which of the following describe situations when MySQL generates warnings?
A. When it is not able to completely fulfill a request.
B. When a system-level error occurs.
C. When an action has possible unintended side-effects.
Answer: A,C

MYSQL examen   1Z0-872 examen   certification 1Z0-872

NO.5 Using column prefix indexing helps reduce
A. The amount of time to write a query
B. The number of results returned
C. The amount of disk I/O needed
D. The amount of disk space needed
Answer: C,D

MYSQL examen   certification 1Z0-872   1Z0-872   certification 1Z0-872

NO.6 Which of the following are valid optimization techniques?
A. Rewrite queries to use indexes
B. Use EXPLAIN
C. Use ORDER BY
Answer: A,B

MYSQL examen   1Z0-872 examen   1Z0-872   1Z0-872

NO.7 Which of the following is a valid method to restrict the amount of records returned from SHOW
WARNINGS.?
A. SHOW WARNINGS LIMIT
B. SHOW WARNINGS LIMIT
C. limit can not be used with show warnings
Answer: A,B

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NO.8 Which of the following best describes how a column prefix index works and why its an advantage?
A. A Column prefix allows for a shorter index, making it read less from disk,
B. A Column prefix allows for a shorter index name, making less code to be written.
C. A Column prefix is another name for a left-most prefix, which is usefully with multi-column indexes.
Answer: A

MYSQL   certification 1Z0-872   1Z0-872 examen

NO.9 Which of the following best describes the major trade-offs for MylSAM fixed-length types vs.
variable-length types, respectively?
A. Fixed-length are slower, but require less disk space, as variable-length are faster, but require more disk
space.
B. Fixed-length are faster and require less disk space, as variable-length are slower and require more
disk space.
C. Fixed-length are faster, but require more disk space, as variable-length are slower, but require less disk
space.
D. Fixed-length are slower and require more disk space, as variable-length are faster and require less
disk space.
Answer: C

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NO.10 Consider the following statement: show COUNT (*) warnings what would be the result of executing this
statement?
A. An error would be returned, as this is not valid syntax.
B. The number of current warnings would be returned.
C. The total number of warnings server-wide would be returned
Answer: B

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2013年12月7日星期六

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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 Fill in the blank with the appropriate word.
A ______specifies that the value of a column (or columns), upon which the index is based, must be
unique.
A. unique index
Answer: A

MYSQL   1Z0-870   1Z0-870   1Z0-870   1Z0-870 examen

NO.2 Fill in the blank with the appropriate word.
The ________data type defines a date that is combined with a time of day along with fractional seconds
that is based on a 24-hour clock.
A. datetime
Answer: A

MYSQL examen   1Z0-870 examen   1Z0-870 examen   certification 1Z0-870   1Z0-870 examen   1Z0-870

NO.3 Which of the following are the types of numeric literals that can be used in arithmetic expressions?
Each correct answer represents a complete solution. Choose all that apply.
A. Numeric
B. Integer
C. Binary
D. Real
Answer: B,D

MYSQL   1Z0-870   certification 1Z0-870   1Z0-870

NO.4 You work as a Database Administrator for Pass4sure.com. The company uses MySQL as its database.
You have created a table named Employees in the database. You want to create a list of
employees working in the organization, but you do not want to display any duplicate row in the report.
Which of the following statements will help you to accomplish the task?
A. SELECT emp_id, emp_name FROM Employees ORDER BY emp_id;
B. SELECT emp_id, emp_name FROM Employees;
C. SELECT DISTINCT emp_id, emp_name FROM Employees;
D. SELECT emp_id, emp_name FROM Employees GROUP BY emp_id;
Answer: C

MYSQL   1Z0-870 examen   certification 1Z0-870   1Z0-870 examen

NO.5 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

MYSQL   1Z0-870 examen   1Z0-870

NO.6 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

MYSQL examen   certification 1Z0-870   1Z0-870 examen   1Z0-870   1Z0-870

NO.7 Which of the following properties of concurrency control refers to the requirement that other operations
cannot access or see the data in an intermediate state during the execution of a transaction?
A. Consistency
B. Durability
C. Atomicity
D. Isolation
Answer: D

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NO.8 You work as a Database Administrator for Pass4sure.com. The company uses MySQL as its database.
You have created a new table named Employees, which keeps all the information of the
employees. You want to add a new row to the Employees table. Which of the following statements will you
use to accomplish the task?
A. INSERT (column1, column2, ...columnN) INTO <table_name> VALUES(value1, value2, ...v alueN);
B. INSERT INTO <table_name>(column1, column2, ...columnN) VALUES(value1 ,value2,
...va lueN);
C. INSERT <table_name>(column1, column2, ...columnN), VALUES(value1, value2, ...valueN );
D. INSERT INTO <table_name>(column1, column2,... columnN), VALUES(value1, value2, ...v alueN);
Answer: B

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NO.9 You work as a Database Administrator for Pass4sure.com. The company uses MySQL as its database.
You have created two tables named Employees and Departments in the database. Now, you want to
display data from both tables. Which of the following actions will you perform to accomplish the task.?
A. Join
B. Table Merge operator
C. HAVING
D. GROUP BY
Answer: A

MYSQL   1Z0-870   1Z0-870   certification 1Z0-870   certification 1Z0-870

NO.10 You work as a Database Administrator for Pass4sure.com. The company uses MySQL as the database
platform. You have created a table named Students in the database. The structure of the table is as
follows:
Stu_ID NUMBER (3) PRIMARY KEY
Stu_Name VARCHAR2 (25) NOT NULL
Fee NUMBER (8, 2)
Class NUMBER (5);
You have executed the following statement for the table "Students":
SELECT e.Stu_Name, m.Fee
FROM Students e, Students m
WHERE e.Stu_ID = m.stu_ID;
Which of the following join types have you used in the above statement?
A. Cross join
B. Equijoin
C. Self join
D. Outer join
Answer: C

MYSQL   certification 1Z0-870   certification 1Z0-870   1Z0-870   1Z0-870 examen

NO.11 Which of the following terms is described in the statement below?
"It is procedural code that is automatically executed in response to certain events on a particular table or
view in a database."
A. Data type
B. Table
C. Datetime data type
D. Database trigger
Answer: D

MYSQL   certification 1Z0-870   1Z0-870   1Z0-870 examen

NO.12 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

MYSQL   certification 1Z0-870   1Z0-870   certification 1Z0-870

NO.13 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

MYSQL   1Z0-870 examen   1Z0-870   1Z0-870   1Z0-870 examen

NO.14 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

certification MYSQL   1Z0-870   1Z0-870   1Z0-870   1Z0-870

NO.15 DRAG DROP
Drag and drop the correct constraint types to their corresponding specifications.
Answer:

NO.16 Fill in the blank with the appropriate term.
A______ provides a concise and flexible means for matching strings of text,
such as particular characters, words, or patterns of characters.
A. regular expression
Answer: A

MYSQL   1Z0-870 examen   1Z0-870   1Z0-870   1Z0-870

NO.17 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

MYSQL examen   1Z0-870   1Z0-870 examen

NO.18 Consider the exhibit given below:
Which of the following queries will return the name of the customer who placed the highest amount of
orders and the total order amount?
A. SELECT CUSTOMER, MAX(UNITPRICE*QUANTITY) AS "TOTAL"
FROM ORDERS
GROUP BY CUSTOMER
/
B. SELECT CUSTOMER, SUM(UNITPRICE*QUANTITY) AS "TOTAL"
FROM ORDERS
WHERE SUM(UNITPRICE*QUANTITY)
=
(SELECT MAX(SUM(UNITPRICE*QUANTITY)
)
FROM ORDERS
GROUP BY CUSTOMER)
GROUP BY CUSTOMER
/
C. SELECT CUSTOMER, SUM(UNITPRICE*QUANTITY) AS "TOTAL"
FROM ORDERS
GROUP BY CUSTOMER
HAVING SUM(UNITPRICE*QUANTITY)
=
(SELECT MAX(SUM(UNITPRICE*QUANTITY)
)
FROM ORDERS
GROUP BY CUSTOMER)
/
D. SELECT CUSTOMER, SUM(UNITPRICE*QUANTITY) AS "TOTAL"
FROM ORDERS
GROUP BY CUSTOMER
HAVING SUM(UNITPRICE*QUANTITY)
=
(SELECT SUM(UNITPRICE*QUANTITY)
FROM ORDERS
GROUP BY CUSTOMER)
/
Answer: C

MYSQL examen   1Z0-870   1Z0-870 examen   certification 1Z0-870   1Z0-870

NO.19 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

MYSQL   1Z0-870   1Z0-870 examen   1Z0-870

NO.20 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

MYSQL   certification 1Z0-870   certification 1Z0-870

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