Oracle 1Z0-047 問題集

質問 1：
View the Exhibit and examine the descriptions of ORDER_ITEMS and ORDERS tables. You want to display the CUSTOMER_ID, PRODUCT_ID, and total (UNIT_PRICE multiplied by
QUANTITY) for the order placed. You also want to display the subtotals for a CUSTOMER_ID as
well as for a PRODUCT ID for the last six months.
Which SQL statement would you execute to get the desired output?

A. SELECT o.customer_id, oi.product_id, SUM(oi.unit_price*oi. quantity) "Total
FROM order_items oi JOIN orders o
ON oi.order_id=o.order_id
GROUP BY ROLLUP (o.customer_id, oi.product_id)
WHERE MONTHS_BETWEEN(order_ date,SYSDATE)<=6;
B. SELECT o.customer_id, oi.product_id, SUM(oi.unit_price*oi. quantity) "Total
FROM order_items oi JOIN orders o
ON oi.order_id=o.order_id
GROUP BY ROLLUP (o.customer_id, oi.product_id)
HAVING MONTHS_BETWEEN(order_ date,SYSDATE)<=6;
C. SELECT o.customer_id, oi.product_id, SUM(oi.unit_price*oi. quantity) "Total
FROM order_items oi JOIN orders o
ON oi.order_id=o.order_id
WHERE MONTHS_BETWEEN(order date,SYSDATE)<=6
GROUP BY ROLLUP (o.customer_id, oi.product_id);
D. SELECT o.customer_id, oi.product_id, SUM(oi.unit_price*oi. quantity) "Total
FROM order_items oi JOIN orders o
ON oi.order_id=o.order_id
GROUP BY ROLLUP (o.customer_id, oi.product_id)
WHERE MONTHS_BETWEEN(order_ date,SYSDATE)>=6;
正解：C

質問 2：
Evaluate the following ALTER TABLE statement:
ALTER TABLE orders SET UNUSED order_date;
Which statement is true?
A. After executing the ALTER TABLE command, you can add a new column called ORDER_DATE to the ORDERS table.
B. ROLLBACK can be used to get back the ORDER_DATE column in the ORDERS table.
C. The ORDER_DATE column should be empty for the ALTER TABLE command to execute successfully.
D. The DESCRIBE command would still display the ORDER_DATE column.
正解：A

質問 3：
Which statements are true regarding the usage of the WITH clause in complex correlated subqueries? (Choose all that apply.)
A. The query name in the WITH clause is visible to other query blocks in the WITH clause as well as to the main query block.
B. The WITH clause can hold more than one query.
C. If the query block name and the table name were the same, then the table name would take precedence.
D. It can be used only with the SELECT clause.
正解：A,B,D

質問 4：
View the Exhibit and examine the data in EMPLOYEES and
DEPARTMENTS tables. In the EMPLOYEES table EMPLOYEE_ID is the PRIMARY KEY and
DEPARTMENT_ID is the FOREIGN KEY. In the DEPARTMENTS table DEPARTMENT_ID is the
PRIMARY KEY.
Evaluate the following UPDATE statement:
UPDATE employees a
SET department_jd =
(SELECT department_id
FROM departments
WHERE location_id = '2100'),
(salary, commission_pct) =
(SELECT 1.1*AVG(salary), 1.5*AVG(commission_pct)
FROM employees b
WHERE a. department_jd = b. department_id)
WHERE first_name|| '||last_name = 'Amit Banda';
What would be the outcome of the above statement?

A. It would not execute successfully because the condition specified with the concatenation operator is not valid.
B. It would not execute successfully because there is no LOCATION_ID 2100 in the DEPARTMENTS table.
C. It would execute successfully and update the relevant data.
D. It would not execute successfully because multiple columns (SALARY,COMMISSION_PCT)cannot be used in an UPDATE statement.
正解：C

質問 5：
Which statement is true regarding Flashback Version Query?
A. It returns versions of rows only within a transaction.
B. It will return an error if the undo retention time is less than the lower bound time or SCN specified.
C. It retrieves all versions including the deleted as well as subsequently reinserted versions of the rows.
D. It can be used in subqueries contained only in a SELECT statement.
正解：C

質問 6：
Which two statements are true regarding the GROUP BY clause in a SQL statement? (Choose two.)
A. Using the WHERE clause after the GROUP BY clause excludes the rows after creating groups.
B. The GROUP BY clause is mandatory if you are using an aggregate function in the SELECT clause.
C. You can use column alias in the GROUP BY clause.
D. Using the WHERE clause before the GROUP BY clause excludes the rows before creating groups.
E. 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.
正解：D,E