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Oracle Database SQL Sample Questions (Q198-Q203):

NEW QUESTION # 198
SELECT *
FROM bricks,colors;
Which two statements are true?

A. You can add an ON clause with a join condition.
B. It returnsthe same rows as SELECT * FROM bricks CROSS JOIN colors.
C. It returns the number of rows in BRICKS plus the number of rows in COLORS.
D. You can add a WHERE clause with filtering criteria.
E. You can add a USING clause with a join condition.

Answer: B,D

NEW QUESTION # 199
Examine the description or the CUSTOMERS table:

For Customers whose income level has a value, you want to display the first name and due amount as 5% of their credit limit. Customers whose due amount is null should not be displayed.
Which query should be used?

A. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMONT FROM customers WHERE cust_income_level IS NOT NULL AND due_amount IS NOT NULL;
B. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMONT FROM customers WHERE cust_income_level IS NOT NULL AND cust_credit_limit IS NOT NULL;
C. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMONT FROM customers WHERE cust_income_level != NULL AND due_amount != NULL;
D. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMONT FROM customers WHERE cust_income_level <> NULL AND due_amount <> NULL;
E. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMOUNT FROM customers WHERE cust_income_level != NULL AND cust_credit_level != NULL;

Answer: B

Explanation:
In Oracle SQL, the correct way to check for non-null values is to use the IS NOT NULL condition. Using != NULL or <> NULL is incorrect because NULL represents the absence of any value, and you cannot use equality or inequality operators to check for NULL.
C . SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMOUNT FROM customers WHERE cust_income_level IS NOT NULL AND cust_credit_limit IS NOT NULL; This query will correctly filter out any customers with a NULL income level or credit limit and then calculate the due amount as 5% of their credit limit for the remaining customers.
Reference:
Oracle Database SQL Language Reference 12c, especially sections on conditions and expressions that deal with NULL values.

NEW QUESTION # 200
Which two statements are true about * TABLES views?

A. You must have SELECT privileges on a table to view it in DBA TABLES.
B. All TABLES displays all tables owned by the current user.
C. USER TABLES displays all tables owned by the current user.
D. You must have SELECT privileges on a table to view it in USER TABLES.
E. You must have SELECT privileges on a table to view it in ALL TABLES.
F. All users can query DBA TABLES successfully.

Answer: C,E

NEW QUESTION # 201
Which two statements are true regarding constraints? (Choose two.)

A. All constraints can be defined at the column level and at the table level.
B. A constraint can be disabled even if the constraint column contains data.
C. A foreign key column cannot contain NULLS.
D. A column with the UNIQUE constraint can contain NULLS.
E. A constraint is enforced only for INSERT operations.

Answer: B,D

NEW QUESTION # 202
You issue this command which succeeds:
SQL> DROP TABLE products;
Which three statements are true?

A. All the table's indexes if any exist, are invalidated but retained.
B. All existing views and synonyms that refer to the table are invalidated but retained.
C. Table data is deleted but the table structure is retained.
D. Table data and the table structure are deleted.
E. Any uncommitted transaction in the session is committed.

Answer: A,B,D

NEW QUESTION # 203
......

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Latest 1z1-071 Exam Registration - 1z1-071 Braindumps Downloads

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Oracle Database SQL Sample Questions (Q198-Q203):

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