Oracle PL 1z0-071 Dumps PDF

For question 134, the correct options are B and F based on the capabilities and design of SQL:

B. It best supports relational databases: SQL is fundamentally designed to manage and query data in relational databases. It is the standard language used for managing relational database management systems (RDBMS) and for performing all types of data operations within them.

F. It provides independence for logical data structures being manipulated from the underlying physical data storage: SQL allows users to interact with the data at a logical level without needing to know how the data is physically stored. This is known as logical data independence, which is a key feature of SQL in managing databases.

Other options are incorrect because:

A: SQL itself doesn't guarantee ACID properties; these are provided by the database management system's transaction control mechanisms.

C, D, E: These statements are incorrect as SQL does not inherently support object-oriented concepts like encapsulation and polymorphism, is not limited to hierarchical data storage, and is not the only language used for both relational and object-oriented databases.

Roles and privileges in Oracle manage access and capabilities within the database:

Option A: False. Roles are not "owned" in the traditional sense by the user who created them. They exist independently within the Oracle database and are assigned to users.

Option B: False. System privileges can be very granular, affecting specific types of operations or database objects, not always the entire database.

Option C: False. Roles are not owned by the SYS schema but are managed by database security and can be created by any user with sufficient privileges.

Option D: True. A role can indeed contain a combination of several privileges, including other roles, allowing for flexible and layered security configurations.

Option E: True. By default, a user has all object privileges for objects they own (i.e., objects in their schema).

Option F: False. PUBLIC is a special designation that applies to all users; individual privileges granted to PUBLIC cannot be revoked from a single user without revoking them from all users.

Option G: True. PUBLIC is a role granted by default to every user in an Oracle database, providing basic privileges necessary for general usability of the database.

B: True. This MERGE statement should execute without errors. It uses a conditionally filtered selection from the products table as a source to update or delete rows in the new_prices table based on whether the prod_id matches and the cost is greater than 150. The delete operation within a MERGE statement is allowed in Oracle when a WHEN MATCHED clause is specified.

The MERGE statement is correctly structured with a USING clause that includes a subquery with a valid WHERE condition, an ON condition that specifies how to match rows between the source and the target, and a WHEN MATCHED THEN clause that specifies the update and delete operations based on the cost condition.

References:Oracle SQL documentation specifies that within a MERGE statement, you can specify a WHEN MATCHED clause to update and/or delete rows in the target table based on the condition specified after the DELETE keyword.

The statements regarding data type conversions and the treatment of literals in SQL expressions involve understanding implicit and explicit data conversions in Oracle SQL.

Statement A is true as invoice_date > '01-02-2019' involves an implicit conversion of the string literal to a date type, based on the NLS_DATE_FORMAT setting, assuming the format matches.

Statement E is true because, similarly to A, invoice_date = '15-march-2019' involves an implicit conversion where the string is automatically converted to a date type according to the Oracle NLS_DATE_FORMAT or an assumed default date format.

Statements B, C, and D involve incorrect or misleading information:

B (qty_sold = '05549821') is misleading and potentially incorrect as leading zeros in a numeric context do not typically require explicit conversion but the presence of spaces might suggest a need for trimming rather than numeric conversion.

C (CONCAT(qty_sold, invoice_date)) would indeed require explicit conversion because CONCAT expects string types, and thus numerical and date values must be explicitly converted to strings before concatenation.

D (qty_sold BETWEEN '101' AND '110') uses implicit conversion where the string literals '101' and '110' are implicitly converted to numbers if qty_sold is a numeric type.