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Oracle Database SQL Sample Questions (Q43-Q48):

NEW QUESTION # 43
Which two statements cause changes to the data dictionary?

A. SELECT * FROM user_ tab._ privs;
B. AITER SESSION set NLs. _DATE FORMAT = 'DD/MM/YYYY';
C. TRUNCATE TABLE emp:
D. DELETE FROM scott. emp;
E. GRANT UPDATE ON scott. emp TO fin manager;

Answer: C,E

NEW QUESTION # 44
Examine this SQL statement
DELETE FROM employees e
WHERE EXISTS
(SELECT' dummy'
FROM emp history
WHERE employee_ id= e. employee id);
Which two are true?

A. The subquery is executed for every row in the EMPLOYEES table.
B. The DELETE statement executes successfully even if the subquery selects multiple rows.
C. The subquery is executed before the DELETE statement is executed.
D. The subquery is not a correlated subquery.
E. All existing rows in the EMPLOYEES table are deleted,

Answer: B,C

Explanation:
For the provided DELETE statement with an EXISTS clause:
* Option B: The subquery is executed before the DELETE statement is executed.
* Subqueries with EXISTS are typically executed before the outer DELETE statement to determine which rows of the outer query satisfy the condition.
* Option D: The DELETE statement executes successfully even if the subquery selects multiple rows.
* The EXISTS condition is used to check for the existence of rows returned by the subquery, regardless of how many rows there are. It returns TRUE if the subquery returns at least one row.
Options A, C, and E are incorrect because:
* Option A: This statement is incorrect; the subquery is indeed a correlated subquery because it references the employee_id from the outer query (employees).
* Option C: This is incorrect because not all existing rows in the EMPLOYEES table will be deleted, only those for which an associated record exists in the emp_history table.
* Option E: While technically the subquery may be evaluated multiple times, it is only executed for those rows in EMPLOYEES that satisfy the condition of the EXISTS clause.

NEW QUESTION # 45
View the Exhibit and examine the structure of the ORDER_ITEMS and ORDERStables.

You are asked to retrieve the ORDER_ID,product_ID, and total price (UNIT_PRICEmultiplied by QUANTITY), where the total price is greater than 50,000.
You executed the following SQL statement:
SELECTprder_id, product_id, unit_price*quantity "Total Price"
FROM order_items
WHERE unit_price*quantity > 50000
NATURAL JOIN orders;
Which statement is true regarding the execution of the statement?

A. The statement would not execute because the WHEREclause is before the NATURAL JOINclause.
B. The statement would not execute because the ON keyword is missing in the NATURAL JOINclause.
C. The statement would not execute because the USING keyword is missing in the NATURAL JOINclause.
D. The statement would execute and provide the desired result.

Answer: A

NEW QUESTION # 46
Which three statements are true about performing Data Manipulation Language (DML) operations on a view in an Oracle Database? (Choose three.)

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 query rows from an underlying table if the table has a PRIMARY KEYand the PRIMARY KEYcolumns are not referenced in the defining query of the view.
C. Insert statements can always be done on a table through a view.
D. Views cannot be used to add or modify rows in an underlying table if the defining query of the view contains the DISTINCTkeyword.
E. Views cannot be used to add or modify rows in an underlying table if the defining query of the view contains aggregating functions.
F. The WITH CHECKclause has no effect when deleting rows from the underlying table through the view.

Answer: A,B,E

NEW QUESTION # 47
Examine the description of the MEMBERStable:

Examine the partial query:
SELECT city, last_name LNAME FROM members ...;
You want to display all cities that contain the string AN. The cities must be returned in ascending order, with the last names further sorted in descending order.
Which two clauses must you add to the query? (Choose two.)

A. ORDER BY 1, LNAME DESC
B. ORDER BY last_name DESC, city ASC
C. WHERE city LIKE `%AN%'
D. ORDER BY 1, 2
E. WHERE city IN (`%AN%')
F. WHERE city = `%AN%'

Answer: A,C

NEW QUESTION # 48
......

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