Insert a blank line in the query output

Is it possible to insert a blank line between two rows of the query output?

In the EMP table, the column LINES is as follows:

LINES
1
2
3
4
1
2
3
1
2
3
4
5

I want to insert a blank line after every 1

Please suggest.

Sanjay

I'm quite puzzled why you need rows in the dataset returned by a select statement that is empty.
If you are using Oracle reports to the release date, you define the presentation of the report to have spaces between the rows returned by the select and have do not need to have the select statement returns a blank line after each line of data. If the output should be obtained by using another client, I think that the customer will have facilities for output formatting.

Admit that you really need "blank lines" between data lines, I see only one way: use a temporary table and do an insert into select temporary_table (...) ... from... where... Then, in this temporary table, you can insert 'empty rows', which is actually not really empty, because they must have some fields that give the order of the rows. And then select in temporary_table, you place your order by the columns that are used to give the order for the release.
Thus

insert into temporary_table (
....
)
select ...
from ...
where ...
;
for r in (
select col1, col2, col3  -- columns used for order by
from temporary_table
order by col1, col2, col3
)
loop
  insert into temporary_table (col1, col2,col3, col4)
  values (r.col1,r.col2,r.col3, null);
end loop;
-- this way, a select * from temporary_tabel order by col1, col2, col3, col4 will return a blank row after each data row

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