1z0-071 Exam Dumps : Oracle Database 12c SQL

To determine which queries will execute successfully, we need to consider the compatibility of the column definitions and the structure of the SELECT statements:

Option A uses the MINUS set operator, which subtracts rows returned by the second SELECT statement from the rows returned by the first. For MINUS to work, the number and the order of columns and their data types must be the same in both queries. This query will not execute successfully because the second SELECT statement does not include all columns from the first SELECT statement, and the data types and sizes of PROD_ID do not match (CHAR(2) vs CHAR(4)).

Option B uses the UNION ALL set operator, which appends the results of the second SELECT statement to the results of the first. Unlike UNION, UNION ALL does not eliminate duplicate rows. This query will execute successfully because UNION ALL does not require the same data types or sizes, and the result will contain all columns from the first SELECT statement filled with NULL for non-matching columns from the second SELECT statement.

Option C uses the UNION set operator, which requires the same number of columns and compatible data types. This query will not execute successfully because PROD_NAME has different data types (CHAR(4) vs VARCHAR2(10)), and the result of a UNION must have the same number of columns with compatible data types in the two SELECT statements.

Option D uses the UNION set operator as well, but unlike Option C, it does not require a specific data type match because both SELECT statements include all columns and UNION is used (which will automatically handle type conversion where necessary). This query will execute successfully.

Option E uses the INTERSECT set operator, which requires the same number and order of columns and their data types to be identical or compatible. This query will not execute successfully because the data types and sizes of PROD_ID do not match (CHAR(2) vs CHAR(4)).

References:

Oracle Documentation on Set Operators: SQL Language Reference - Set Operators

Oracle Documentation on Data Type Precedence: SQL Language Reference - Data Type Precedence

In conclusion, only Option B and Option D will execute successfully because they adhere to the rules of the UNION ALL and UNION operators respectively, regarding column count and data type compatibility.

The WITH GRANT OPTION clause in Oracle SQL allows the grantee to grant the privilege they have received to another user or role.

E. It cannot be used to pass on privileges to PUBLIC by the grantee: The WITH GRANT OPTION does not allow the grantee to pass on privileges to PUBLIC. Only the object's owner or a user with the GRANT ANY OBJECT PRIVILEGE system privilege can grant privileges to PUBLIC.

F. It can be used to pass on privileges to other users by the grantee: This is true. When a user receives privileges with the WITH GRANT OPTION, they can grant that privilege to another user or role.

References:

Oracle Database SQL Language Reference 12c, specifically sections on user privileges and the WITH GRANT OPTION.

A. Correct. Truncating a table, especially in another schema, requires the ALTER ANY TABLE or DROP ANY TABLE system privilege. B. Correct. Accessing external files through the database involves the CREATE ANY DIRECTORY privilege, which is a system privilege. C. Correct. Creating a session in a database, which is required to log in, necessitates the CREATE SESSION system privilege. D. Incorrect. Querying any table is an object privilege, which can be granted by the owner of the table. E. Incorrect. The WITH GRANT OPTION clause is used with object privileges, not system privileges. F. Incorrect. Executing a procedure in another schema requires the EXECUTE object privilege on that procedure.

Oracle Database Security Guide provides the details about system privileges necessary for these actions.