專業的1z0-071考試，高質量的考試指南幫助妳壹次性通過1z0-071考試

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1z0-071考試, 1z0-071熱門考古題, 1z0-071題庫分享, 1z0-071考古題更新, 1z0-071真題

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最新的 Oracle PL/SQL Developer Certified Associate 1z0-071 免費考試真題 (Q285-Q290):

問題 #285
Examine the description of the BOOKS table:

The table has 100 rows.
Examine this sequence of statements issued in a new session;
INSERT INTO BOOKS VALUES ('ADV112' , 'Adventures of Tom Sawyer', NULL, NULL); SAVEPOINT a; DELETE from books; ROLLBACK TO SAVEPOINT a; ROLLBACK; Which two statements are true?

  • A. The first ROLLBACK command restores the 101 rows that were deleted, leaving the inserted row still to be committed.
  • B. The second ROLLBACK command does nothing.
  • C. The second ROLLBACK command replays the delete.
  • D. The first ROLLBACK command restores the 101 rows that were deleted and commits the inserted row.
  • E. The second ROLLBACK command undoes the insert.

答案：B,E

解題說明：
B: True. The second ROLLBACK command would not do anything because the first ROLLBACK TO SAVEPOINT a; already undid the delete operation, and there was no other DML operation between the first and the second ROLLBACK.
E: True. The second ROLLBACK command undoes the insert because after the first ROLLBACK TO SAVEPOINT a; there are no savepoints defined, so a subsequent ROLLBACK would undo all transactions to the beginning of the current session or last COMMIT.
The ROLLBACK command is used to undo transactions that have not yet been committed. Rolling back to a savepoint only undoes transactions up to that savepoint, and a subsequent ROLLBACK without a savepoint name will undo all uncommitted changes since the last COMMIT.
Reference:
Oracle SQL documentation on the ROLLBACK statement provides details on how it interacts with savepoints and the effects it has on the transactions within a session.


問題 #286
Examine the structure of the MEMBERS table: (Choose the best answer.)

Examine the SQL statement:
SQL > SELECT city, last_name LNAME FROM MEMBERS ORDER BY 1, LNAME DESC; What would be the result execution?

  • A. It fails because a column number and a column alias cannot be used together in the ORDER BY clause.
  • B. It fails because a column alias cannot be used in the ORDER BY clause.
  • C. It displays all cities in descending order, within which the last names are further sorted in descending order.
  • D. It displays all cities in ascending order, within which the last names are further sorted in descending order.

答案：D


問題 #287
Examine the structure of the DEPARTMENTS table.

You execute the following command:

Which two statements are true? (Choose two.)

  • A. Synonyms existing of the DEPARTMENTStable would have to be re-created.
  • B. Indexes created on the COUNTRYcolumn exist until the DROP UNUSED COLUMNScommand is executed.
  • C. A new column, COUNTRY, can be added to the DEPARTMENTStable after executing the command.
  • D. Unique key constraints defined on the COUNTRYcolumn are removed.
  • E. Views created in the DEPARTMENTStable that include the COUNTRYcolumn are automatically modified and remain valid.

答案：C,D


問題 #288
Examine the data in the CUSTOMERStable:

You want to list all cities that have more than one customer along with the customer details.
Evaluate the following query:

Which two JOIN options can be used in the blank in the above query to give the correct output? (Choose two.)

  • A. FULL OUTER JOIN
  • B. JOIN
  • C. LEFT OUTER JOIN
  • D. RIGHT OUTER JOIN
  • E. NATURAL JOIN

答案：B,D


問題 #289
View the Exhibit and examine the structure of the EMPLOYEES and JOB_HISTORY tables.

Examine this query which must select the employee IDs of all the employees who have held the job SA_MAN at any time during their employment.
SELECT employee_id
FROM employees
WHERE job_id = 'SA_MAN'
-------------------------------------
SELECT employee_id
FROM job_history
WHERE job_id='SA_MAN';
Choose two correct SET operators which would cause the query to return the desired result. (Choose two.)

  • A. INTERSECT
  • B. UNION
  • C. UNION ALL
  • D. MINUS

答案：B,C


問題 #290
......

1z0-071熱門考古題: https://www.vcesoft.com/1z0-071-pdf.html

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