1. What will be the output for this query:
select 1 from dual minus select a from dual;

This will produce Error:
Expression must have same datatype as corresponding expression

3. Explain What are transportable table spaces and the need to use them?

Transportable tablespaces are the fastest way for moving large volume of data between two oracle databases. We can use the transportable tablespaces feature to copy a set of tablespaces from one oracle database to another. Moving data using transportable tablespaces is much faster than performing either an export/import or unload/load the same data.

4. What are transportable table spaces and the need to use them?

Transportable tablespaces are the fastest way for moving large volume of data between two oracle databases. We can use the transportable tablespaces feature to copy a set of tablespaces from oneoracle database to another. Moving data using transportable tablespaces is much faster than performing either an export/import or unload/load the same data.