[Free] 2018(Jan) EnsurePass Testinsides Oracle 1z0-882 Dumps with VCE and PDF 31-40

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Oracle Certified Professional, MySQL 5.6 Developer

Question No: 31

Examine the fruit and wine tables: Fruit

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You execute this query:

SELECT fruited, fruitname FROM fruit UNION

SELECT id, name, country FROM wine; What is the result?

  1. The query succeeds and returns five columns of data.

  2. The query succeeds and returns two columns of data.

  3. The query falls because UNION does not work on tables with different number of columns.

  4. The query falls because the number of columns in the SELECT in the SELECT clauses are not equal.

Answer: D

Question No: 32

Consider the structures of the country and countrylanguage tables. mysql gt;DESCRIBE country;

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mysqlgt; DESCRIBE countrylanguage;

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Which query will give you the list of all European countries where German is spoken?

  1. SELECT Code AS c, Name FROM Country

    WHERE Continent = ‘Europe’ AND EXISTS (

    SELECT *

    FROM CountryLanguage WHERE CountryCode = Code And Language= ‘German’

    )

  2. SELECT Code AS c, Name FROM Country

    WHERE Continent = ‘Europe’ AND Name IN (

    SELECT *

    FROM CountryLanguage WHERE CountryCode = Code AND Language =’German’

    )

  3. SELECT Code AS c, Name FROM Country

    WHERE Continent = ‘ Europe’ AND EXIST ANY (

    SELECT Language, CountryCode FROM CountryLanguage WHERE CountryCode =Code AND Language = ‘German’

    )

  4. SELECT Code AS c, Name FROM Country

WHERE Continent = ‘Europe’ AND (

SELECT *

FROM CountryLanguage WHERE CountryCode =Code AND Language =’German’

)

Answer: A

Question No: 33

Consider the statements: Mysqlgt; drop function foo;

ERROR 1305 (420000): FUNCTION test, foo does not exist Mysql gt; show warnings;

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Mysqlgt; get diagnostics condition 2 @msg=MESSAGE_TEXT; What is the result of the final statement?

  1. An empty result is returned.@msg is set to message of the warning.

  2. A warning message is generated that adds error 1758 (invalid condition number) to the diagnostics area.

  3. A line will be an output to the error log that contains the warning message details from the failed command.

  4. An error is generated as only one condition can exist in the diagnostics area.

Answer: B

Question No: 34

You wish to create a trigger on the country table. It will populate two session variables based on the row that is deleted:

->@old _countryNames with the value of the Name field

->@old _countryName with the value of the code field

You may assume that only one row is ever deleted at a time. CREATE TRIGGER Country_ad

AFTER DELETE ON Country FOR EACH ROW

SET @old _CountryName= NEW.Name,

@ old _CountryCode=NEW.Code;

What is the outcome of the CREATE TRIGGER statement?

  1. The trigger will be created successfully.

  2. An error results because the NEW keyword cannot be used in a DELETE trigger.

  3. An error results because FOR EACH ROW is invalid syntax.

  4. An error results because a BEGIN. . .END block is required.

Answer: B

Question No: 35

You have two test tables:

->Code_innodb as InnoDB engine

->Code_ myisam as MYISAM engine

The tables have the same structure:

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The tables have one row of data:

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You execute an INSERT statement on both code_myisam tables and receive duplicate key errors:

mysqlgt; INSERT INTO code_innodb VALUES (1, ‘Alpha’), (2, ‘Beta’), (3, ‘charlie,),(4, ‘Delta’);

ERROR 1062 (23000): Duplicate entry ‘3’ for key ‘PRIMARY’

Mysqlgt; INSERT INTO code_myisam VALUES (1, ‘Alpha’), (2, ‘Beta’), (3, ‘charlie’), (4, ‘Delta’);

ERROR 1062 (23000); Duplicate entry ‘3’ for key ‘PRIMARY’ What is the expected output of the SELECT statements?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: A

Question No: 36

An application tracks usage of educational courses in a company. Many people can take one course. Each person can take multiple courses. The data has been stored in one table but it is growing too large. You decide to normalize the table.

What would a normalized data model contain?

  1. Two tables: employee and course, with foreign keys on employee ID and course ID.

  2. Three tables: employee, course, and a table cross-referencing employee IDs and course IDs

  3. Two tables: an employee table with multiple course IDs , and a course table

  4. Four tables: employee, course, courses by employee, and employees by course

Answer: B

Reference: http://stackoverflow.com/questions/1258743/normalization-in-mysql

Question No: 37

Which statement is true about the difference between HASH and BTREE INDEXES?

  1. HASH indexes support rightmost prefixing of keys, which makes them faster than BTREE indexes in many causes.

  2. HASH indexes can be used by the optimizer to speed up ORDER BY operations and not BTREE indexes.

  3. HASH indexes are used only for equality comparisons (= orlt;=gt;),whereas BTREE indexes can also be used for range searches (gt;orlt;).

  4. HASH indexes are much faster than BTREE indexes but can only be used for a single column.

Answer: C

Reference: https://devcenter.heroku.com/articles/postgresql-indexes

Question No: 38

Inspect the query:

Mysqlgt;SELECT dept_no, emp_no FROM employees JOIN dept _manager USING(emp_no) WHERE dept_no’d004′;

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4 rows in set (0.00 sec)

Mysqlgt;EXPLAIN SELECT dept_no, emp_no FROM employees JOIN dept_manager USING (emp_no) WHERE dept_no=’d004′;

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2 rows in set (0.00 sec)

Which two statements are true about the EXPLAIN output?

  1. All data for the result is read from the indexex.

  2. The PRIMARY KEY is used for filtering in both tables.

  3. The minimal number of rows possible are read.

  4. The dept_manager table has 4 times as many rows than the employees table.

Answer: A,C

Question No: 39

Which statement correctly demonstrates using a subquery as a scalar expression?

  1. SELECT (

    SELECT SUM (population) FROM Country

    SELECT SUM (population) FROM Country

    WHERE Code =’CAN’

    )

  2. SELECT SUM (population) FROM Country

    WHERE Code =”USA”

    (SELECT SUM (population) FROM Country

    WHERE Code =.’CAN’

    )

  3. SELECT

    (SELECT SUM (population) FROM Country

    WHERE Code =’USA’

    FROM country WHERE Code= ‘CAN’

    )

  4. (SELECT SUM (population) FROM Country

WHERE Code =”USA’

Answer: A

Reference: http://dev.mysql.com/doc/refman/5.0/en/scalar-subqueries.html

Question No: 40

You started a MySQL command -line session with sq1_ mode (empty), and created the person table with the structure:

Mysqlgt; DESC person;

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You issue:

INSERT INTO person VALUES (‘casper’, ‘undefined’) What is the effect?

  1. ‘Casper’ and ‘ undefined values are inserted into the ‘name’ and gender’ column.

  2. The server returns an error indicating that ‘undefined’ cannot be inserted into a column of ENUM type

  3. The server returns a warning and the empty string is inserted to the ‘gender’ column.

  4. The server returns a warning and the first specified value ,”male” is inserted to the gender column.

Answer: C

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