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2021 Jun 1z0-047 Study Guide Questions:
Q151. Evaluate the following CREATE SEQUENCE statement:
CREATE SEQUENCE seql START WITH 100 INCREMENT BY 10 MAXVALUE 200 CYCLE NOCACHE;
The sequence SEQ1 has generated numbers up to the maximum limit of 200. You issue the following SQL statement:
SELECT seql.nextval FROM dual;
What is displayed by the SELECT statement?
A. 1
B. 10
C. 100
D. an error
Answer: A
Q152. 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.
A. SELECT o.customer_Id, oi.productj_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 orderjtems 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
GROUP BY ROLLUP (o.customer_id, oi.product_id)
WHERE MONTHS_BETWEEN(order_date, SYSDATE) >= 6;
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
WHERE MONTHS_BETWEEN(order_date, SYSDATE) <= 6
GROUP BY ROLLUP (o.customer_id, oi.product_id);
Answer: D
Q153. Which statement is true regarding Flashback Version Query?
A. It returns versions of rows only within a transaction.
B. It can be used in subqueries contained only in a SELECT statement.
C. It will return an error if the undo retention time is less than the lower bound time or SCN specified.
D. It retrieves all versions including the deleted as well as subsequently reinserted versions of the rows.
Answer: D
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Q154. View the Exhibit and examine the structure of ORDERS and ORDER_ITEMS tables.
ORDER__ID is the primary key in the ORDERS table. It is also the foreign key in the ORDER_ITEMS table wherein it is created with the ON DELETE CASCADE option.
Which DELETE statement would execute successfully?
A. DELETEorder_id
FROMorders
WHEREorder_total< 1000;
B. DELETEorders
WHERE order_total < 1000;
C. DELETE
FROM orders
WHERE (SELECTorder_id
FROM order_items);
D. DELETE orders o, order_itemsi
WHEREo.order id = i.order id;
Answer: B
Q155. 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. ORDERBY 3;
B. ORDER BY'b'
C. ORDER BYDEPT_ID;
D. ORDER BY DEPTNAME;
Answer: AC
Q156. Which two statements are true regarding the GROUP BY clause in a SQL statement? (Choose two.)
A. You can use column alias in the GROUP BY clause.
B. Using the WHERE clause after the GROUP BY clause excludes the rows after creating groups.
C. The GROUP BY clause is mandatory if you are using an aggregate function in the SELECT 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.
Answer: DE
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Q157. View the Exhibit and examine the structure of the CUSTOMERS table.
CUSTOMER_VU is a view based on CUSTOMERS_BR1 table which has the same structure as CUSTOMERS table. CUSTOMERS needs to be updated to reflect the latest information about the customers.
What is the error in the following MERGE statement?
MERGE INTO customers c
USING customer_vu cv
ON (c.customer_id = cv.customer_id)
WHEN MATCHED THEN
UPDATE SET
c.customer_id = cv.customer_id,
c.cust_name = cv.cust_name,
c.cust_email = cv.cust_email,
c.income_level = cv. Income_level
WHEN NOT MATCHED THEN
INSERT VALUESfcv.customer_id.cv.cus_name.cv.cus_email.cv.income_level)
WHERE cv. Income_level >100000;
A. The CUSTOMERJD column cannot be updated.
B. The INTO clause is misplaced in the command.
C. The WHERE clause cannot be used with INSERT.
D. CUSTOMER VU cannot be used as a data source
Answer: A
Q158. The first DROP operation is performed on PRODUCTS table using the following command:
DROP TABLE products PURGE;
Then you performed the FLASHBACK operation by using the following command:
FLASHBACK TABLE products TO BEFORE DROP;
Which statement describes the outcome of the FLASHBACK command?
A. It recovers only thetablestructure.
B. It recovers thetablestructure,data,andtheindexes.
C. It recovers thetablestructure anddatabutnotthe related indexes.
D. It is not possible to recover the table structure, data, or the related indexes.
Answer: D
Q159. Given below is the list of meta character syntaxes and their descriptions in random order: Meta character syntax Description 1)^ a) Matches character not in the list 2) [^…] b) Matches character when it occurs at the beginning of a line 3) | c) Treats the subsequent meta character as a literal 4) d) Matches one of the characters such as the OR operator
Identify the option that correctly matches the meta character syntaxes with their descriptions.
A. 1-b, 2-a, 3-d,4-c
B. 1-a, 2-b, 3-d,4-c
C. 1-d, 2-b, 3-a,4-c
D. 1-b,2-c,3-d,2-a
Answer: A
Q160. Which two statements are true regarding the EXISTS operator used in the correlated subqueries? (Choose two.)
A. The outer query stops evaluating the result set of the inner query when the first value is found.
B. It is used to test whether the values retrieved by the inner query exist in the result of the outer query.
C. It is used to test whether the values retrieved by the outer query exist in the result set of the inner query.
D. The outer query continues evaluating the result set of the inner query until all the values in the result set are processed.
Answer: AC