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Oracle Database SQL Sample Questions (Q182-Q187):

NEW QUESTION # 182
Which two statements are true about sequences created in a single instance Oracle database? (Choose two.)

A. When a database instance shuts down abnormally, sequence numbers that have been cached but not used are available again when the instance is restarted.
B. When the MAXVALUE limit for a sequence is reached, it can be increased by using the ALTER SEQUENCE statement.
C. DELETE <sequencename> would remove a sequence from the database.
D. CURRVAL is used to refer to the most recent sequence number that has been generated for a particular sequence.
E. The numbers generated by an explicitly defined sequence can only be used to insert data in one table.

Answer: B,D

Explanation:
Explanation
References:
http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_2012.htm#SQLRF00817
https://docs.oracle.com/cd/A84870_01/doc/server.816/a76989/ch26.htm

NEW QUESTION # 183
Which two statements are true regarding savepoints? (Choose two.)

A. Savepoints are effective for both COMMIT and ROLLBACK.
B. Savepoints may be used to ROLLBACK.
C. Savepoints are effective only for COMMIT.
D. Savepoints can be used for only DML statements.
E. Savepoints can be used for both DML and DDL statements.

Answer: B,D

NEW QUESTION # 184
View the Exhibit and examine the structure of the PROMOTIONS table.

Evaluate the following SQL statement:

Which statement is true regarding the outcome of the above query?

A. It shows COST_REMARK for all the promos in the promo category 'TV'.
B. It produces an error because the subquery gives an error.
C. It shows COST_REMARK for all the promos in the table.
D. It produces an error because subqueries cannot be used with the CASE expression.

Answer: C

NEW QUESTION # 185
View the Exhibit and examine the structure of the PRODUCT_INFORMATION and INVENTORIES tables.
You have a requirement from the supplies department to give a list containing PRODUCT_ID, SUPPLIER_ID, and QUANTITY_ON_HAND for all the products wherein QUANTITY_ON_HAND is less than five.
Which two SQL statements can accomplish the task? (Choose two.)

A. SELECT i.product_id, i.quantity_on_hand, pi.supplier_idFROM product_information pi JOIN inventories iON (pi.product_id=i.product_id)USING (product_id) AND quantity_on_hand < 5;
B. SELECT i.product_id, i.quantity_on_hand, pi.supplier_idFROM product_information pi JOIN inventories iON (pi.product_id=i.product_id) AND quantity_on_hand < 5;
C. SELECT product_id, quantity_on_hand, supplier_idFROM
product_informationNATURAL JOIN inventories AND quantity_on_hand < 5;
D. SELECT i.product_id, i.quantity_on_hand, pi.supplier_idFROM product_information pi JOIN inventories iON (pi.product_id=i.product_id)WHERE quantity_on_hand < 5;

Answer: B,D

NEW QUESTION # 186
Which two statements are true about truncate and delete?

A. truncate leavers any indexes on the table in an UNUSABLE STATE.
B. TRUNCATE can use a where clause to determine which row(s) should be removed.
C. the result of a truncate can be undone by issuing a ROLLBACK.
D. the result of a delete can be undone by issuing a rollback
E. delete can use a where clause to determine which row(s) should be removed.

Answer: D,E

Explanation:
In the case of SQL commands TRUNCATE and DELETE:
* A. the result of a delete can be undone by issuing a rollback: DELETE is a DML operation that affects rows individually and can be rolled back if it is performed within a transaction.
* B. delete can use a where clause to determine which row(s) should be removed: DELETE operation allows the use of a WHERE clause to specify which rows should be deleted based on certain conditions.
Incorrect options are:
* C: TRUNCATE does not support the use of a WHERE clause. It is designed to remove all rows from a table swiftly and cannot be conditional.
* D: TRUNCATE does not leave indexes in an unusable state; it simply removes all rows.
* E: TRUNCATE is a DDL command and its operation typically cannot be rolled back in many SQL database systems, including Oracle.

NEW QUESTION # 187
......

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