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Oracle Database SQL Sample Questions (Q269-Q274):

NEW QUESTION # 269
Examine the description of the SALES1 table:

SALES2is a table with the same description as SALES1.
Some sales data is duplicated in both tables.
You want to display the rows from the SALES1table which are not present in the SALES2 table.
Which set operator generates the required output?

A. UNION
B. SUBTRACT
C. UNION ALL
D. INTERSECT
E. MINUS

Answer: E

NEW QUESTION # 270
Examine the structure proposed for the TRANSACTIONStable:

Which two statements are true regarding the creation and storage of data in the above table structure?
(Choose two.)

A. The TRANS_DATEcolumn would be able to store day, month, century, year, hour, minutes, seconds, and fractions of seconds.
B. The CUST_CREDIT_LIMITcolumn would be able to store decimal values.
C. The CUST_STATUScolumn would store exactly one character.
D. The TRANS_VALIDITYcolumn would have a maximum size of one character.
E. The CUST_STATUScolumn would give an error.
F. The TRANS_VALIDITYcolumn would give an error.

Answer: C,F

NEW QUESTION # 271
View the Exhibit and examine the structure of CUSTOMERStable.
Using the CUSTOMERStable, you need to generate a report that shows an increase in the credit limit by
15% for all customers. Customers whose credit limit has not been entered should have the message "Not Available" displayed.
Which SQL statement would produce the required result?

A. SELECT NVL(cust_credit_limit), 'Not Available') "NEW CREDIT"
FROM customers;
B. SELECT TO_CHAR (NVL(cust_credit_limit * .15), 'Not Available') "NEW CREDIT" FROM customers;
C. SELECT NVL(cust_credit_limit * .15), 'Not Available') "NEW CREDIT"
FROM customers;
D. SELECT NVL (TO CHAR(cust_credit_limit * .15), 'Not Available') "NEW CREDIT" FROM customers;

Answer: D

NEW QUESTION # 272
Examine this description of the PRODUCTS table:

Rows exist in this table with data in all the columns. You put the PRODUCTS table in read-only mode. Which three commands execute successfully on PRODUCTS?

A. TRUNCATE TABLE products;
B. ALTER TAELE products DROP COLUMN expiry_date;
C. ALTER TABLE products SET UNUSED(expiry_date);
D. ALTER TABLE products DROP UNUSED COLUMNS
E. DROP TABLE products
F. CREATE INDEX price_idx on products (price);

Answer: D,E,F

Explanation:
B). CREATE INDEX price_idx on products (price); E. ALTER TABLE products DROP UNUSED COLUMNS; F. DROP TABLE products.
Comprehensive and Detailed Explanation WITH all References:
When a table is in read-only mode, most types of modifications are prohibited. However, certain operations can still be performed.
A). Incorrect. You cannot drop a column from a table that is in read-only mode, as it is a modifying operation.
B). Correct. You can create an index on a read-only table. Creating an index does not modify the actual rows within the table; it builds a separate structure used for faster access. C. Incorrect. The SET UNUSED statement marks one or more columns as unused so they can be dropped when the database is not busy. This operation is considered a modifying operation and therefore is not allowed on a read-only table. D. Incorrect.
Truncate is a DDL operation that would delete all rows from a table. This operation is not allowed on a read-only table. E. Correct. The ALTER TABLE ... DROP UNUSED COLUMNS statement is used to drop columns that have been previously marked as unused using the SET UNUSED statement. This operation is allowed because it only affects previously marked unused columns, not actively used data. F. Correct.
Dropping a table is allowed even if it's in read-only mode because it is a DDL operation that does not operate on the rows of the table but rather on the object itself.
The behavior of read-only tables and the operations that can be performed on them are detailed in the Oracle Database SQL Language Reference and Oracle Database Administrator's Guide.

NEW QUESTION # 273
Examine the description or the BOOKS_TRANSACTIONS 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 AMOUNT
FROM customers
WHERE cust_income_level IS NOT NULL
AND cust_credit_limit IS NOT NULL;
B. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level !=NULL
AND due_amount !=NULL;
C. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level <> NULL
AND due_amount <> NULL;
D. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level IS NOT NULL
AND due_amount IS NOT 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: A

Explanation:
D: True. This query selects the first name and calculates the due amount as 5% of the credit limit from the customers table where the income level is not null and the credit limit is also not null. The IS NOT NULL operator is used to check for non-null values correctly.
The IS NOT NULL operator is the correct way to check for non-null values in SQL. The <> NULL and != NULL comparisons are incorrect because NULL is not a value that can be compared using these operators; it represents the absence of a value.
There is no due_amount column in the customers table according to the structure provided, so any WHERE clause referencing due_amount is irrelevant and incorrect. The due_amount is a derived column in the SELECT clause.
The correct syntax to check for non-null values is IS NOT NULL, which is used in the WHERE clause of the correct answer.
Reference:
The use of IS NOT NULL in the WHERE clause to filter out null values is documented in Oracle's SQL reference.
NULL comparisons must be done with IS NULL or IS NOT NULL for correct logical evaluation in SQL.

NEW QUESTION # 274
......

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1z1-071 Latest Test Braindumps, Exam 1z1-071 Passing Score

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Oracle Database SQL Sample Questions (Q269-Q274):

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