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NEW QUESTION 24
Which two are true about transactions in the Oracle Database?

A. An uncommitted transaction is automatically committed when the user exits SQL*Plus.B. A session can see uncommitted updates made by the same user in a different session.C. DML statements always start new transactions.D. DDL statements automatically commit only data dictionary updates caused by executing the DDL.E. A DDL statement issued by a session with an uncommitted transaction automatically Commits that transaction.

Answer: A,E

 

NEW QUESTION 25
View the Exhibit and examine, the description for the SALES and CHANNELS tables.
(Choose the best answer.)

You issued this SQL statement:
INSERT INTO SALES VALUES (23, 2300, SYSDATE,
(SELECT CAHNNEL_ID
FROM CHANNELS
WHERE CHANNEL_DESC='DIRECT SALES'), 12, 1, 500);
Which statement is true regarding the result?

A. The statement will fail because the sub-query in the VALUES clause is not enclosed within single quotation marks.B. The statement will fail because a subquery cannot be used in a VALUES clause.C. The statement will fail because the VALUES clause is not required with the subquery.D. The statement will execute and a new row will be inserted in the SALES table.

Answer: D

 

NEW QUESTION 26
Which statements are correct regarding indexes? (Choose all that apply.)

A. For each DML operation performed, the corresponding indexes are automatically updated.B. Indexes should be created on columns that are frequently referenced as part of any expression.C. A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically attempts to creates a unique index.D. When a table is dropped, the corresponding indexes are automatically dropped.

Answer: A,C,D

Explanation:
Explanation
References:
http://viralpatel.net/blogs/understanding-primary-keypk-constraint-in-oracle/

 

NEW QUESTION 27
Examine the following query:
SQL> SELECT prod_id, amount_sold
FROM sales
ORDER BY amount_sold
FETCH FIRST 5 PERCENT ROWS ONLY;
What is the output of this query?

A. It displays the first 5 percent of the rows from the SALES table.B. It displays 5 percent of the products with the highest amount sold.C. It displays 5 percent of the products with the lowest amount sold.D. It results in an error because the ORDER BY clause should be the last clause.

Answer: C

Explanation:
Explanation
References:
https://oracle-base.com/articles/12c/row-limiting-clause-for-top-n-queries-12cr1

 

NEW QUESTION 28
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