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Oracle Database 12c SQL

Question No: 11

Which two statements are true about sequences created in a single instance database? (Choose two.)

  1. CURRVAL is used to refer to the last sequence number that has been generated

  2. DELETE lt;sequencenamegt; would remove a sequence from the database

  3. The numbers generated by a sequence can be used only for one table

  4. When the MAXVALUE limit for a sequence is reached, you can increase the MAXVALUE limit by using the ALTER SEQUENCE statement

  5. When a database instance shuts down abnormally, the sequence numbers that have been cached but not used would be available once again when the database instance is restarted

Answer: A,D Explanation:

Gaps in the Sequence

Although sequence generators issue sequential numbers without gaps, this action occurs independent of a commit or rollback. Therefore, if you roll back a statement containing a sequence, the number is lost.

Another event that can cause gaps in the sequence is a system crash. If the sequence caches values in memory, those values are lost if the system crashes.

Because sequences are not tied directly to tables, the same sequence can be used for multiple tables.

However, if you do so, each table can contain gaps in the sequential numbers.

Modifying a Sequence

If you reach the MAXVALUE limit for your sequence, no additional values from the sequence are allocated and you will receive an error indicating that the sequence exceeds the MAXVALUE. To continue to use the sequence, you can modify it by using the ALTER SEQUENCE statement

To remove a sequence, use the DROP statement:

DROP SEQUENCE dept_deptid_seq;

Question No: 12

View the Exhibit and examine the descriptions of the DEPT and LOCATIOMS tables.

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You want to update the CITY column of the DEPT table for all the rows with the corresponding value in the CITY column of the LOCATIONS table for each department.

Which SQL statement would you execute to accomplish the task?

  1. UPDATE dept d

    SET city = ANY (SELECT city FROM locations l);

  2. UPDATE dept d

    SET city = (SELECT city FROM locations l) WHERE d.location_id = l.location_id;

  3. UPDATE dept d

    SET city = (SELECT city FROM locations l

    WHERE d.location_id = l.location_id);

  4. UPDATE dept d

SET city = ALL (SELECT city FROM locations l

WHERE d.location_id = l.location_id);

Answer: C

Question No: 13

The BOOKS_TRANSACTIONStable exists in your database. Examine the SQL statement:

SQLgt;SELECT * FROM books_transactionsORDER BY 3; What is the outcome on execution?

  1. The execution tails unless the numeral 3 in the order by clause is replaced by a column name,

  2. Rows are displayed in the order that they are stored in the table only for the three rows with the lowest values in the key column.

  3. Rows are displayed in the order that they are stored in the table only for the first three rows.

  4. Rows are displayed sorted in ascending order of the values in the third column in the table.

Answer: C

Question No: 14

Which statement is true regarding the default behavior of the ORDER BY clause?

  1. In a character sort, the values are case-sensitive

  2. NULL values are not considered at all by the sort operation

  3. Only those columns that are specified in the SELECT list can be used in the ORDER BY clause

  4. Numeric values are displayed from the maximum to the minimum value if they have decimal positions

Answer: A Explanation:

Character Strings and Dates

Character strings and date values are enclosed with single quotation marks. Character values are case-sensitive and date values are format-sensitive.

The default date display format is DD-MON-RR.

Question No: 15

Which two statements are true about Data Manipulation Language (DML) statements?

  1. AH INSERT INTO. . .VALUES. . statement can add multiple rows per execution to a table.

  2. An UPDATE…SET… statement can modify multiple rows based on multiple conditions

    on a table.

  3. A DELETE FROM ….. statement can remove rows based on only a single condition on a table.

  4. An INSERT INTO…VALUES….. statement can add a single row based on multiple conditions on a table.

  5. A DELETE FROM….. statement can remove multiple rows based on multiple conditions on a table.

  6. An UPDATE…SET…. statement can modify multiple rows based on only a single condition on a table.

Answer: A,C

Question No: 16

View the Exhibit and examine the structure of the stores table.

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You want to display the name of the store along with the address, START_DATE, PROPERTV_PRICE, and the projected property price, which is 115% of the property price. The stores displayed must have START_DATE in the range of 36 months starting from 01- Jan-2000 and above.

Which SQL statement would get the desired output? A)

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B)

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C)

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D)

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: C

Question No: 17

Evaluate the following two queries:

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Which statement is true regarding the above two queries?

  1. Performance would improve query 2 only if there are null values in the CUST CREDIT LIMIT column.

  2. There would be no change in performance.

  3. Performance would degrade in query 2.

  4. Performance would improve in query 2.

Answer: B

Question No: 18

The first DROP operation is performed on PRODUCTS table using the following command:

DROP TABLE products PURGE;

Then you performed the FLASHBACK operation by using the following command: FLASHBACK TABLE products TO BEFORE DROP;

Which statement describes the outcome of the FLASHBACK command?

  1. It recovers only the table structure.

  2. It recovers the table structure, data, and the indexes.

  3. It recovers the table structure and data but not the related indexes.

  4. It is not possible to recover the table structure, data, or the related indexes.

Answer: D

Question No: 19

View the Exhibit and examine the data in ORDERS_MASTER and MONTHLYjDRDERS tables.

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Evaluate the following MERGE statement:

MERGE INTO orders_master o USING monthly_orders m

ON (o.order_id = m.order_id) WHEN MATCHED THEN

UPDATE SET o.order_total = m.order_total DELETE WHERE (m.order_total IS NULL) WHEN NOT MATCHED THEN

INSERT VALUES (m.order_id, m.order_total);

What would be the outcome of the above statement?

  1. The ORDERS_MASTER table would contain the ORDERJDs 1 and 2.

  2. The ORDERS_MASTER table would contain the ORDERJDs 1,2 and 3.

  3. The ORDERS_MASTER table would contain the ORDERJDs 1,2 and 4.

  4. The ORDERS MASTER table would contain the ORDER IDs 1,2,3 and 4.

Answer: C

Question No: 20

Which two statements are true regarding roles? (Choose two.)

  1. A role can be granted to itself.

  2. A role can be granted to PUBLIC.

  3. A user can be granted only one role at any point of time.

  4. The REVOKE command can be used to remove privileges but not roles from other users.

  5. Roles are named groups of related privileges that can be granted to users or other roles.

Answer: B,E

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