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Oracle Database SQL Sample Questions (Q16-Q21):

NEW QUESTION # 16
View the Exhibit and examine the structure of the ORDERS table. The ORDER_ID column
is the
PRIMARY KEY in the ORDERS table.
Evaluate the following CREATE TABLE command:
CREATE TABLE new_orders(ord_id, ord_date DEFAULT SYSDATE, cus_id)
AS
SELECT order_id.order_date,customer_id
FROM orders;
Which statement is true regarding the above command?

A. The NEW_IDRDERS table would get created and all the constraints defined on the specified columns in the ORDERS table would be passed to the new table.
B. The NEW_IDRDERS table would get created and only the NOT NULL constraint defined on the specified columns would be passed to the new table.
C. The NEW_IDRDERS table would not get created because the column names in the CREATE TABLE command and the SELECT clause do not match.
D. The NEW_IDRDERS table would not get created because the DEFAULT value cannot be specified in the column definition.

Answer: B

NEW QUESTION # 17
The SALES table has columns PROD_IDand QUANTITY_SOLDof data type NUMBER.
Which two queries execute successfully? (Choose two.)

A. SELECT prod_id FROM sales WHERE quantity_sold > 55000 GROUP BY prod_id HAVING
B. BY COUNT(*) >10;
SELECT COUNT(prod_id) FROM sales GROUP BY prod_id WHERE quantity_sold > 55000;
C. BY prod_id HAVING COUNT(*) >10;
SELECT COUNT (prod_id) FROM sales WHERE quantity_sold > 55000 GROUP BY
D. COUNT(*) >10;
SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT(*) > 10 GROUP
E. prod_id;
SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT(*) > 10 GROUP

Answer: A,C

NEW QUESTION # 18
Which three statements are true about performing DML operations on a view with no INSTEAD OF triggers defined?

A. Views cannot be used to add rows to an underlying table If the table has columns with NOT NULL constraints lacking default values which are not referenced in the defining query of the view.
B. Views cannot be used to add or modify rows in an underlying table If the defining query of the view contains the DISTINCT keyword.
C. The WITH CHECK clause has no effect when deleting rows from the underlying table through the view.
D. Delete statements can always be done on a table through a view.
E. Views cannot be used to query rows from an underlying table if the table has a PRIMARY KEY and the primary key columns are not referenced in the defining query of the view.
F. Insert statements can always be done on a table through a view.

Answer: A,B,E

NEW QUESTION # 19
View the Exhibit and examine the structure of ORDER_ITEMS and ORDERS tables.

You need to remove from the ORDER_ITEMS table those rows that have an order status of 0 or 1 in the ORDERS table.
Which two DELETE statements are valid (Choose two.)

A. DELETE *FROM order_itemsWHERE order_id IN (SELECT order_id)FROM ordersWHERE order_status IN (0,1));
B. DELETEFROM order_itemsWHERE order_id IN (SELECT order_idFROM ordersWHERE orders_status in (0,1));
C. DELETE FROM order_items iWHERE order_id = (SELECT order_id FROM orders oWHERE i.order_id = o.order_id AND order_status IN (0,1));
D. DELETEFROM (SELECT * FROM order_items I,orders oWHERE i.order_id = o.order_id AND order_status IN (0,1));

Answer: B,D

NEW QUESTION # 20
Examine the description of the CUSTONERS table:

CUSTNO is the PRIMARY KEY.
You must determine if any customers' details have been entered more than once using a different CUSTNO, by listing all duplicate names.
Which two methods can you use to get the required result?

A. subquery
B. RIGHT OUTER JOIN with self join
C. self Join
D. PULL OUTER JOIN with self join
E. LEFT OUTER JOIN with self join

Answer: A,C

Explanation:
To find duplicate customer details entered under different CUSTNO values, one would typically use methods that compare records within the same table:
* C. Subquery: A subquery can be used to compare customer details in the CUSTOMERS table and identify duplicates. This subquery can look for matches in the customer details while having different CUSTNO.
* E. Self Join: A self join can also be used for this purpose. This involves joining the CUSTOMERS table to itself on the columns containing customer details to identify rows that have the same information but different CUSTNO.
References:
* Oracle Database SQL Language Reference 12c, particularly the sections on self joins and subqueries, as these can be utilized to find duplicate rows based on specified criteria.

NEW QUESTION # 21
......

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