Oracle 1Z0-047 問題集

質問 1：
A non-correlated subquery can be defined as________ .
A. a set of sequential queries, all of which must always return a single value
B. a set of one or more sequential queries in which generally the result of the inner query is used as the search value in the outer query
C. a set of sequential queries, all of which must return values from the same table
D. a SELECT statement that can be embedded in a clause of another SELECT statement only
正解：B

質問 2：
View the Exhibit and examine the description of the EMPLOYEES table.
Evaluate the following SQL statement:
SELECT employee_id, last_name, job_id, manager_id, LEVEL
FROM employees
START WITH employee_id = 101
CONNECT BY PRIOR employee_id=manager_id ;
Which two statements are true regarding the output of this command? (Choose two.)

A. The output would be in bottom-up hierarchy starting with EMPLOYEE_ID having value 101.
B. The LEVEL column displays the number of employees in the hierarchy under the employee having the EMPLOYEE_ID 101.
C. The LEVEL column displays the level in the hierarchy at which the employee is placed under the employee having the EMPLOYEE_ID 101
D. The output would be in top-down hierarchy starting with EMPLOYEE_ID having value 101.
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 3：
OE and SCOTT are the users in the database. The ORDERS table is owned by OE. Evaluate the statements issued by the DBA in the following sequence:
CREATE ROLE r1;
GRANT SELECT, INSERT ON oe. orders TO r1;
GRANT r1 TO scott;
GRANT SELECT ON oe. orders TO scott;
REVOKE SELECT ON oe.orders FROM scott;
What would be the outcome after executing the statements?
A. The REVOKE statement would give an error because the SELECT privilege has been granted to the role R1
B. The REVOKE statement would remove the SELECT privilege from SCOTT as well as from the role R1.
C. SCOTT would not be able to query the OE.ORDERS table.
D. SCOTT would be able to query the OE.ORDERS table.
正解：D

質問 4：
View the Exhibit and examine the data in the DEPARTMENTS tables.
Evaluate the following SQL statement:
SELECT department_id "DEPT_ID", department_name , 'b' FROM departments WHERE department__id=90 UNION SELECT department_id, department_name DEPT_NAME, 'a' FROM departments WHERE department_id=10
Which two ORDER BY clauses can be used to sort the output of the above statement? (Choose two.)

A. ORDER BY DEPT_ID;
B. ORDER BY'b';
C. ORDER BY DEPT NAME;
D. ORDER BY 3;
正解：A,D

質問 5：
View the Exhibit and examine the description of the PRODUCT_INFORMATION table.
You want to display the expiration date of the warranty for a product. Which SQL statement would you execute?

A. SELECT product_jd, TO_YMINTERVAL(warranty_period)
FROM product_information;
B. SELECT product_id, SYSDATE + warranty_period
FROM product_information;
C. SELECT product_id, TO_YMINTERVAL(SYSDATE) + warranty_period
FROM product_information;
D. SELECT product_jd, TO_YMINTERVAL(SYSDATE + warranty_period)
FROM product_information;
正解：B

質問 6：
View the Exhibit and examine the description of the EMPLOYEES table. You want to display the EMPLOYE_ID, FIRST_NAME, and DEPARTMEN_ID for all the employees who work in the same department and have the same manager as that of the employee having EMPLOYE_ID 104. To accomplish the task, you execute the following SQL statement:
SELECT employee_id, first_name, department_id FROM employees WHERE (manager_id, department_id) =(SELECT department_id, manager_id FROM employees WHERE employee_id = 104) AND employee_id <> 104;
When you execute the statement it does not produce the desired output. What is the reason for this?
A. The WHERE clause condition in the main query is using the = comparison operator, instead of EXISTS.
B. The columns in the WHERE clause condition of the main query and the columns selected in the subquery should be in the same order.
C. The WHERE clause condition in the main query is using the = comparison operator, instead of the IN operator.
D. The WHERE clause condition in the main query is using the = comparison operator, instead of the = ANY operator.
正解：B