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Oracle Database SQL Sample Questions (Q239-Q244):

NEW QUESTION # 239
Which two are true about the data dictionary?

A. Base tables in the data dictionary have the prefix DBA_.
B. The SYS user owns all base tables and user-accessible views in the data dictionary.
C. All users have permissions to access all information in the data dictionary by default
D. All user actions are recorded in the data dictionary.
E. The data dictionary is constantly updated to reflect changes to database objects, permissions, and data.

Answer: B,E

Explanation:
C). True, the data dictionary is constantly updated to reflect changes to the metadata of the database objects, permissions, and structures, among other things.E. True, the SYS user owns all base tables in the data dictionary. These base tables underlie all data dictionary views that are accessible by the users.
A, B, and D are not correct because: A. Base tables do not necessarily have the prefix DBA_; instead, DBA_ is a prefix for administrative views that are accessible to users with DBA privileges. B. The data dictionary records metadata about the actions, not the actions themselves. D. Not all users have access to all information in the data dictionary. Access is controlled by privileges.
References:
* Oracle documentation on data dictionary and dynamic performance views: Oracle Database Reference
* Understanding the Oracle data dictionary: Oracle Database Concepts

NEW QUESTION # 240
You issued this command:

Which three statements are true?

A. All constraints defined on HR.EMPLOYEES are dropped.
B. Sequences used to populate columns in the HR.EMPLOYEES table are dropped.
C. All indexes defined on HR.EMPLOYEES are dropped.
D. The HR.EMPLOYEES table may be moved to the recycle bin.
E. Synonyms for HR.EMPLOYEES are dropped.
F. Views referencing HR.EMPLOYEES are dropped.

Answer: A,C,F

NEW QUESTION # 241
View the Exhibit and examine the description for the PRODUCTS and SALES table.

PROD_ID is a primary key in the PRODUCTS table and foreign key in the SALES table with ON DELETE CASCADE option. The SALES table contains data for the last three years. You want to remove all the rows from the PRODUCTS table for which no sale was done for the last three years.
Which is the valid DELETE statement?

A. DELETEFROM productsWHERE prod_id = (SELECT prod_idFROM salesWHERE time_id - 3*365 = SYSDATE );
B. DELETEFROM productsWHERE prod_id = (SELECT prod_idFROM salesWHERE SYSDATE >= time_id - 3*365 );
C. DELETEFROM productsWHERE prod_id IN (SELECT prod_idFROM salesWHERE SYSDATE -3*365 >= time_id);
D. DELETEFROM productsWHERE prod_id IN (SELECT prod_idFROM salesWHERE time_id >= SYSDATE - 3*365 );

Answer: C

NEW QUESTION # 242
Examine this query:
SELECT TRUNC (ROUND(156.00,-2),-1) FROM DUAL; What is the result?

A. 0
B. 1
C. 2
D. 3
E. 4

Answer: C

Explanation:
The query uses two functions: ROUND and TRUNC. The ROUND function will round the number 156.00 to the nearest hundred because of the -2 which specifies the number of decimal places to round to. This will result in 200. Then the TRUNC function truncates this number to the nearest 10, due to the -1 argument, which will give us 200 as the result since truncation does not change the rounded value in this case.
* A. 16 (Incorrect)
* B. 160 (Incorrect)
* C. 150 (Incorrect)
* D. 200 (Incorrect)
* E. 100 (Incorrect)

NEW QUESTION # 243
Examine thestructure of the BOOKS_TRANSACTIONS table:

You want to display the member IDs, due date, and late fee as $2 for all transactions.
Which SQL statement must you execute? A)

B)

C)

D)

A. Option A
B. Option C
C. Option D
D. Option B

Answer: B

NEW QUESTION # 244
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