Oracle Certification Exam Question:

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Which two statements are true regarding views? (Choose two.)
A. A subquery that defines a view cannot include the GROUP BY clause
B. A view is created with the subquery having the DISTINCT keyword can be updated
C. A view that is created with the subquery having the pseudo column ROWNUM keyword cannot
be updated
D. A Data Manipulation Language (DML) operation can be performed on a view that is created
with the subquery having all the NOT NULL columns of a table

Answer:

C. A view that is created with the subquery having the pseudo column ROWNUM keyword cannot
be updated
D. A Data Manipulation Language (DML) operation can be performed on a view that is created
with the subquery having all the NOT NULL columns of a table

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Explain Which two statements are true regarding views? (Choose two.)
A. A subquery that defines a view cannot include the GROUP BY clause
B. A view is created with the subquery having the DISTINCT keyword can be updated
C. A view that is created with the subquery having the pseudo column ROWNUM keyword cannot
be updated
D. A Data Manipulation Language (DML) operation can be performed on a view that is created
with the subquery having all the NOT NULL columns of a table

Suppose you need to generate a list of all customer last names with their credit limits from the
CUSTOMERS table. Those customers who do not have a credit limit should appear last in the list.
Which two queries would achieve the required result? (Choose two.)
A. SELECT cust_last_name,cust_credit_limit
FROM customers
ORDER BY cust_credit_limit DESC;
B. SELECT cust_last_name,cust_credit_limit
FROM customers
ORDER BY cust_credit_limit;
C. SELECT cust_last_name,cust_credit_limit
FROM customers
ORDER BY cust_credit_limit NULLS LAST;
D. SELECT cust_last_name,cust_credit_limit
FROM customers
ORDER BY cust_last_name,cust_credit_limit NULLS LAST;