Oracle 1z0-071 Exam With Confidence Using Practice Dumps

In Oracle SQL, substitution variables (&1) can be used to dynamically replace a value in a SQL statement at runtime. To avoid being prompted for a value when executing a query that includes a substitution variable:

A. Use the DEFINE command before executing the query: By setting a value for a substitution variable using the DEFINE command, Oracle will use this value instead of prompting the user for input.

D. Execute the SET VERIFY OFF command before executing the query: The SET VERIFY OFF command suppresses the prompt for substitution variables by turning off the verification feature. This makes Oracle use the currently defined value for the variable.

References:

Oracle Database SQL Language Reference 12c, particularly the sections on substitution variables, the DEFINE command, and the SET command.

The Oracle Data Pump access driver allows for specific actions with external tables:

B. Read data from an external table and load it into a table in the database. Data Pump can be used to efficiently transfer data between external tables and internal database tables.

C. Query data from an external table. The Data Pump access driver supports querying data directly from external tables.

F. Read data from a table in the database and insert it into an external table. The Data Pump can also export data from database tables to external table formats.

Options A, D, and E are incorrect:

A and D are incorrect as the creation of a directory object is not specific to the Data Pump access driver but is a general external table requirement.

E is incorrect because DML operations directly on external tables are not supported; they are read-only.

For the sorting of output in compound queries (INTERSECT, UNION, etc.):

D. The first column in the first SELECT of the compound query: By default, Oracle does not automatically sort the results of SET operations unless an ORDER BY clause is explicitly stated. However, if an ORDER BY is implied or specified without explicit columns, the default sorting would logically involve the first column specified in the first SELECT statement of the compound query.