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Oracle Database SQL Sample Questions (Q431-Q436):

NEW QUESTION # 431
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 before the DELETE statement is executed.
B. The subquery is not a correlated subquery.
C. All existing rows in the EMPLOYEE table are deleted.
D. The DELETE statement executes successfully even if the subquery selects multiple rows.
E. The subquery is executed for every row in the EMPLOYEES table.

Answer: D,E

Explanation:
The provided DELETE statement uses a correlated subquery to determine which rows should be deleted from the EMPLOYEES table.
* A. The subquery is indeed executed for every row in the EMPLOYEES table. This is because it references e.employee_id, which is a column from the outer query, making it a correlated subquery.
* B. The subquery is a correlated subquery, as explained above.
* C. The subquery is executed for each row, not before the DELETE statement.
* D. Not all existing rows in the EMPLOYEES table are deleted, only those that have a corresponding employee_id in the EMP_HISTORY table.
* E. The DELETE statement executes successfully even if the subquery selects multiple rows because the EXISTS condition only checks for the presence of rows, not their count.
References:
* Oracle Database SQL Language Reference 12c Release 1 (12.1), DELETE Statement
* Oracle Database SQL Language Reference 12c Release 1 (12.1), Subquery Factoring
* Oracle Database SQL Language Reference 12c Release 1 (12.1), Correlated Subqueries

NEW QUESTION # 432
Which two statements are true regarding single row functions? (Choose two.)

A. SYSDATE : returns the database server current date and time.
B. MOD : returns the quotient of a division.
C. TRUNC : can be used with NUMBER and DATE values.
D. CONCAT : can be used to combine any number of values.
E. TRIM : can be used to remove all the occurrences of a character from a string.
F. INSTR : can be used to find only the first occurrence of a character in a string.

Answer: A,C

Explanation:
Explanation

NEW QUESTION # 433
Evaluate the following SQL statement:
SELECT product_name || 'it's not available for order'
FROM product_information
WHERE product_status = 'obsolete';
You received the following error while executing the above query:
ERROR
ORA-01756: quoted string not properly terminated
What would you do to execute the query successfully?

A. Use Quote (q) operator and delimiter to allow the use of single quotation mark in the literal character string.
B. Do not enclose the character literal string in the SELECT clause within the single quotation marks.
C. Use escape character to negate the single quotation mark inside the literal character string in the SELECT clause.
D. Enclose the literal character string in the SELECT clause within the double quotation marks.

Answer: A

Explanation:
References:
http://docs.oracle.com/cd/B19306_01/server.102/b14200/sql_elements003.htm

NEW QUESTION # 434
Evaluate the following CREATE TABLE command:

Which statement is true regarding the above SQL statement?

A. It would execute successfully and only ORD_ITM_IDX index would be created.
B. It would give an error because the USING INDEX is not permitted in the CRETAE TABLE command.
C. It would execute successfully and two indexes ORD_ITM_IDX and ORD_ITM_ID PK would be created.
D. It would give an error because the USING INDEX clause cannot be used on a composite primary.

Answer: A

NEW QUESTION # 435
Examine the command:

What does ON DELETE CASCADE imply?

A. When the BOOKStable is dropped, the BOOK_TRANSACTIONStable is dropped.
B. When the BOOKStable is dropped, all the rows in the BOOK_TRANSACTIONStable are deleted but the table structure is retained.
C. When a value in the BOOKS.BOOK_IDcolumn is deleted, the corresponding value is updated in the BOOKS_TRANSACTIONS.BOOK_IDcolumn.
D. When a row in the BOOKStable is deleted, the rows in the BOOK_TRANSACTIONStable whose BOOK_IDmatches that of the deleted row in the BOOKStable are also deleted.

Answer: D

NEW QUESTION # 436
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