[Free] 2018(Jan) EnsurePass Examcollection Oracle 1z0-071 Dumps with VCE and PDF 31-40

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Oracle Database 12c SQL

Question No: 31

Evaluate the following ALTER TABLE statement:

ALTER TABLE orders SET UNUSED order_date;

Which statement is true?

  1. The DESCRIBE command would still display the ORDER_DATE column.

  2. ROLLBACK can be used to get back the ORDER_DATE column in the ORDERS table.

  3. The ORDER_DATE column should be empty for the ALTER TABLE command to execute successfully.

  4. After executing the ALTER TABLE command, you can add a new column called ORDER_DATE to the ORDERS table.

Answer: D

Question No: 32

Examine the command:

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What does ON DELETE CASCADE Imply?

  1. When the books table is dropped, the BOOK_TRANSACTIONS table is dropped.

  2. When the books table is dropped, all the rows in the BOOK_TRANSACTIONS table are deleted but the table structure is retained.

  3. When a row in the books table is deleted, the rows in the BOOK TRANSACTIONS table whose BOOK_ID matches that of the deleted row in the books table are also deleted.

  4. When a value in the BOOKS.BOOK_ID column is deleted, the corresponding value is updated in the books transactions. BOOK_ID column.

Answer: C

Question No: 33

Examine thestructure of the BOOKS_TRANSACTIONS table:

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You want to display the member IDs, due date, and late fee as $2 for all transactions.

Which SQL statement must you execute? 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: 34

You issue the following command to drop the PRODUCTS table: SQLgt;DROP TABLE products;

What is the implication of this command? (Choose all that apply.)

  1. All data in the table are deleted but the table structure will remain

  2. All data along with the table structure is deleted

  3. All viewsand synonyms will remain but they are invalidated

  4. The pending transaction in the session is committed

  5. All indexes on the table will remain but they are invalidated

Answer: B,C,D

Question No: 35

Which two statements are true regarding the GROUP BY clause in a SQL statement? (Choose two.)

  1. You can use column alias in the GROUP BY clause.

  2. Using the WHERE clause after the GROUP BY clause excludes the rows after creating groups.

  3. The GROUP BY clause is mandatory if you are using an aggregate function in the SELECT clause.

  4. Using the WHERE clause before the GROUP BY clause excludes the rows before creating groups.

  5. If the SELECT clause has an aggregate function, then those individual columns without an aggregate function in the SELECT clause should be included in the GROUP BY clause.

Answer: D,E

Question No: 36

When does a transaction complete? (Choose all that apply.)

  1. When a PL/SQL anonymous block is executed

  2. When a DELETE statement is executed

  3. When a data definition language statement is executed

  4. When a TRUNCATE statement is executed after the pending transaction

  5. When a ROLLBACK command is executed

Answer: C,D,E

Question No: 37

Examine the commands used to createDEPARTMENT_DETAILS andCOURSE_DETAILS:

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You want to generate a list of all department IDs along with any course IDs that may have been assigned to them.

Which SQL statement must you use? 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: 38

You want to display 5 percent of the rows from the sales table for products with the lowestAMOUNT_SOLD and also want to include the rows that have the sameAMOUNT_SOLDeven if this causes the output to exceed 5 percent of the rows.

Which query willprovide the required result?

  1. SELECT prod_id, cust_id, amount_sold FROM sales

    ORDER BY amount_sold

    FETCH FIRST 5 PERCENT ROWS WITH TIES;

  2. SELECT prod_id, cust_id, amount_sold

    FROM sales

    ORDER BY amount_sold

    FETCH FIRST 5 PERCENT ROWS ONLY WITH TIES;

  3. SELECT prod_ id, cust_id, amount_sold FROM sales

    ORDER BY araount_sold

    FETCH FIRST 5 PERCENT ROWS WITH TIES ONLY;

  4. SELECT prod_id, cust_id, amount_sold FROM sales

ORDER BY amount sold

FETCH FIRST 5 PERCENT ROWS ONLY;

Answer: B

Question No: 39

View the Exhibit and examine the structure of the ORDERS table. The ORDER_ID column is the

PRIMARY KEY in the ORDERS table.

Evaluate the following CREATE TABLE command:

CREATE TABLE new_orders(ord_id, ord_date DEFAULT SYSDATE, cus_id) AS

SELECT order_id.order_date,customer_id FROM orders;

Which statement is true regarding the above command?

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  1. The NEW_IDRDERS table would not get created because the DEFAULT value cannot be specified in the column definition.

  2. The NEW_IDRDERS table would get created and only the NOT NULL constraint defined on the specified columns would be passed to the new table.

  3. The NEW_IDRDERS table would not get created because the column names in the CREATE TABLE command and the SELECT clause do not match.

  4. The NEW_IDRDERS table would get created and all the constraints defined on the specified columns in the ORDERS table would be passed to the new table.

Answer: B

Question No: 40

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

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Which two tasks would require subqueries or joins to be executed in a single statement? (Choose two.)

  1. listing of customers who do not have a credit limit and were born before 1980

  2. finding the number of customers, in each city, whose marital status is #39;married#39;

  3. finding the average credit limit of male customers residing in #39;Tokyo#39; or #39;Sydney#39;

  4. listing of those customers whose credit limit is the same as the credit limit of customers residing in the city #39;Tokyo#39;

  5. finding the number of customers, in each city, whose credit limit is more than the average credit limit of all the customers

Answer: D,E Explanation:

Describe the Types of Problems That the Subqueries Can Solve

There are many situations where you will need the result of one query as the input for another.

Use of a Subquery Result Set for Comparison Purposes

Which employees have a salary that is less than the average salary? This could be answered by two statements, or by a single statement with a subquery. The following example uses two statements:

select avg(salary) from employees;

select last_name from employees where salary lt; result_of_previous_query ; Alternatively, this example uses one statement with a subquery:

select last_name from employees where salary lt; (select avg(salary)from employees);

In this example, the subquery is used to substitute a value into the WHERE clause of the parent query: it is returning a single value, used for comparison with the rows retrieved by the parent query.

The subquery could return a set of rows. For example, you could use the following to find all departments that do actually have one or more employees assigned to them:

select department_name from departments where department_id in (select distinct(department_id) from employees);

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