最省時最高效的學習方法

我們的1Z0-007練習材料有三種不同版本：PDF，軟件版本和APP在線版本。它們為不同的考生提供了選擇其研究方法的可能性。如果您是辦公室工作人員，您可以在地鐵或公交車上學習1Z0-007真實考試的在線版本；如果你是一名學生，你可以在排隊吃飯時復習；如果你是家庭主婦，你可以在孩子睡覺時學習。同時，我們的學習資料支持離線學習，避免了沒有網絡就無法學習的情況。同時，使用1Z0-007測試引擎進行審核，讓您從標題中就能查看知識點，不僅可以讓您更深刻地記住知識點，還可以讓您避免閱讀書籍的枯燥過程。

保證100％通過

我們相信所有購買1Z0-007練習材料的學生只要能夠按照我們的學習材料提供的內容，每天進行學習，並通過模擬考試定期自我檢驗，就能順利通過專業資格考試。一旦您不幸使用我們的1Z0-007真實考試題庫未通過考試，我們將全額退款。退款流程非常簡單。只要您向員工提供您的成績單，您很快就會收到退款。當然，在您購買之前，我們的學習資料將為您提供免費試用服務，只要您登錄我們的網站，您就可以免費下載我們的試用版。我相信在您嘗試1Z0-007測試引擎後，您會愛上它們。

語言易於理解

作為一個行業新人，專業書籍中那些難以理解的單詞和表達常常讓你感到懊惱，但1Z0-007練習材料將幫助你完美地解決這個問題。由學習材料聘請的行業專家，將通過示例，圖表等解釋所有難以理解的專業詞彙。 1Z0-007實際測試中使用的所有語言都非常簡單易懂。使用我們的學習資料，您不必擔心您無法理解解專業書籍的內容。你也不需要花費昂貴的學費去輔導班。 1Z0-007測試引擎可以幫助您解決學習中的所有問題。

1Z0-007練習材料不僅適用於學生，也適用於上班族;不僅適用於工作的退伍軍人，也適用於新招募的新人。我們的學習材料使用非常簡單易懂的語言，以確保所有人都能學習和理解。 1Z0-007真正的考試也可以讓你避免課本閱讀的枯燥，但讓你掌握練習過程中的所有重要知識。選擇1Z0-007測試引擎的原因如下。

下載最新試用版

最新的 9i DBA 1Z0-007 免費考試真題:

1. Which two statements about views are true? (Choose two.)

A) A view must have aliases defined for the column names in the SELECT statement.
B) A view can be created as a join on two or more tables.
C) A view can be created as read only.
D) A view cannot be created with a GROUP BY clause in the SELECT statement.
E) A view cannot have an ORDER BY clause in the SELECT statement.

2. Evaluate the SQL statement:
1 SELECT a.emp_name, a.sal, a.dept_id, b.maxsal 2 FROM employees a,
3 (SELECT dept_id, MAX(sal) maxsal
4.FROM employees
5.GROUP BY dept_id) b
6.WHERE a.dept_id = b.dept_id
7.AND a.sal < b.maxsal;
What is the result of the statement?

A) The statement produces an error at line 6.
B) The statement produces an error at line 1.
C) The statement returns the employee name, salary, department ID, and maximum salary earned in the department of the employee for all departments that pay less salary then the maximum salary paid in the company.
D) The statement returns the employee name, salary, department ID, and maximum salary earned in the department of the employee for all employees who earn less than the maximum salary in their department.
E) The statement produces an error at line 3.

3. The EMP table contains these columns:

You need to display the employees who have not been assigned to any department.
You write the SELECT statement:
SELECT LAST_NAME, SALARY, DEPARTMENT_ID
FROM EMP
WHERE DEPARTMENT_ID = NULL;
What is true about this SQL statement?

A) The WHERE clause should be changed to use an outer join to display the desired results.
B) The operator in the WHERE clause should be changed to display the desired results.
C) The column in the WHERE clause should be changed to display the desired results.
D) The SQL statement displays the desired results.

4. What is true about sequences?

A) A sequence always increments by 1.
B) The start value of the sequence is always 1.
C) The minimum value of an ascending sequence defaults to 1.
D) The maximum value of descending sequence defaults to 1.

5. Examine the structure of the EMPLOYEES table:

What is the correct syntax for an inline view?

A) SELECT a.last name, a.salary, a.department_id FROM employees a WHERE a.department_id IN (SELECT department_id FROM employees b GROUP BY department_id having salary = (SELECT max(salary) from employees))
B) maxsal FROM employees a, (SELECT department_id, max(salary)maxsal FROM employees GROUP BY department_id) b WHERE a.department_id = b.department_id AND a.salary < b.maxsal;
C) SELECT a.last_name, a.salary, a.department_id,
D) SELECT a.last_name, a.salary, a.department_id
FROM employees a
WHERE (a.department_id, a.salary) IN
(SELECT department_id, a.salary) IN
(SELECT department_id max(salary)
FROM employees b
GROUP BY department_id
ORDER BY department_id);
E) SELECT a.last_name, a.salary, a.department_id
FROM employees a
WHERE a.salary =
(SELECT max(salary)
FROM employees b
WHERE a.department_id = b.department_id);

問題與答案：