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Oracle Database SQL Sample Questions (Q141-Q146):

NEW QUESTION # 141
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 execute successfully and two indexes ORD_ITM_IDX and ORD_ITM_ID PK would be created.
C. It would give an error because the USING INDEX clause cannot be used on a composite primary.
D. It would give an error because the USING INDEX is not permitted in the CRETAE TABLE command.

Answer: A

NEW QUESTION # 142
Examine these SQL statements that are executed in the given order:

What will be the status of the foreign key EMP_MGR_FK?

A. It will be enabled and deferred.
B. It will be enabled and immediate.
C. It will remain disabled and can be re-enabled manually.
D. It will remain disabled and can be enabled only by dropping the foreign key constraint and re-creating it.

Answer: C

NEW QUESTION # 143
Which two statements are true about the data dictionary?

A. The data dictionary is accessible when the database is closed.
B. Views with the prefix all_, dba_ and useb_ are not all available for every type of metadata.
C. The data dictionary does not store metadata in tables.
D. Views with the prefix all_ display metadata for objects to which the current user has access.
E. Views with the prefix dba_ display only metadata for objects in the SYS schema.

Answer: B,D

Explanation:
The data dictionary contains metadata (data about data) about the database and its objects.
A). False. DBA_ views display metadata for objects accessible to the database administrator, not only for the SYS schema.
B). True. ALL_ views display information about all the objects that the current user has access to. This does not necessarily mean the user has privileges on these objects, only that the user can see them.
C). False. The data dictionary is not accessible when the database is closed because it requires the database to be open in order to access the system tables.
D). True. Not all types of metadata are available in all three prefixes (ALL_, DBA_, USER_). Some specific metadata might only be available in one or two of these view types.
E). False. The data dictionary stores metadata in tables. The various views (ALL_, DBA_, USER_, etc.) provide different perspectives on this data.
References:
* Oracle Documentation on Data Dictionary and Dynamic Performance Views:
https://docs.oracle.com/cd/B28359_01/server.111/b28310/datadict.htm

NEW QUESTION # 144
Which two are true about self joins?

A. They require the NOT EXISTS operator in the join condition.
B. They are always equijoins.
C. They have no join condition.
D. They require table aliases.
E. They require the EXISTS opnrator in the join condition.
F. They can use INNER JOIN and LEFT JOIN.

Answer: D,F

NEW QUESTION # 145
Which two statements are true about views?

A. Tables in the defining query of a view must always exist in order to create the view.
B. Views can be indexed.
C. Views can be updated without the need to re-grant privileges on the view.
D. The wITH CHECK clause prevents certain rows from being displayed when querying the view.
E. Theethi CHEcK clause prevents certalin rows from being updated or inserted in the underying table through the view.

Answer: A,C

Explanation:
Views in Oracle have specific properties regarding how they can be used and what limitations apply to them:
A . Oracle does not allow indexing directly on views. However, a view can display data from indexed tables.
B . The WITH CHECK OPTION clause on a view prevents DML operations that would result in rows that do not satisfy the view's filter criteria. It doesn't prevent certain rows from being updated or inserted in the underlying table through the view per se.
C . The tables (or other views) referenced in the creating query of a view must exist at the time the view is created, making this statement true.
D . Views do not require privileges to be re-granted when the view is updated; they are separate from the underlying object privileges, making this statement true.
E . The WITH CHECK OPTION clause is used to ensure that all data modifications through the view are consistent with the view's defining query, not to prevent rows from being displayed.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "CREATE VIEW" Oracle Database Concepts, 12c Release 1 (12.1): "Views"

NEW QUESTION # 146
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