Add blank rows between a group of mutliple rows - Oracle - oracle

Question

Is there a possibility to add blank rows in a group of data rows dynamically ? I have the below query which fetches data in multiple rows. I want to separate, say add blank row after each 5 rows.
The query :
select php.ref_dcp_key, sum(php.group_booking), count(php.group_booking), 0
from gx_pnr_history ph, gx_pnr_his_prof php
where ph.gmpnr_loc_key = php.gmpnr_loc_key
group by php.ref_dcp_key order by php.ref_dcp_key;

Answer 1

#SandeepGowada, you'd have to create an outer structure for the rows and put in the 6th padding row after every 5 data rows.
I second the view of #juergend that this should really be done in the presentation layer (although often it probably requires no less code overall to do it there than in SQL - but it does frustrate the workings of anything other than a static report, like datagrids that allow re-sorting or filtering)
I've knocked together some untested code (using Oracle syntax) which shows an example of how it's done - how we prepare the base data, then build a table of placeholders for all necessary rows, then join the base data onto the placeholders in the appropriate places. I've made some of the calculations a bit more elaborate to show where the number 5 constant is being used.
Also, I haven't included any code to knock off any surplus padding rows in the final group (i.e. as it stands the number of rows returned will always be a multiple of 6, regardless of the underlying data).
Nor have I included any code regarding the required numbers_table or sequence generator.
WITH base_data AS
(
SELECT
php.ref_dcp_key
,sum(php.group_booking) AS group_booking_sum
,count(php.group_booking) AS group_booking_count
,0 AS zero_value_column
,MOD(ROW_NUMBER() OVER (ORDER BY php.ref_dcp_key) - 1, 5) AS group_line_num
,( (ROW_NUMBER() OVER (ORDER BY php.ref_dcp_key) + (5 - 1)) / 5 ) AS row_group_num
--all appearances of the number 5 constants determine the number of lines per group
FROM
gx_pnr_history /*AS*/ ph
INNER JOIN
gx_pnr_his_prof /*AS*/ php
ON (ph.gmpnr_loc_key = php.gmpnr_loc_key)
GROUP BY
php.ref_dcp_key
)
,row_structure AS
(
SELECT
MOD(number - 1, (5 + 1)) AS group_line_num
,number + ((5 + 1) - 1) / (5 + 1) AS row_group_num
FROM
number_table /*this needs to be a reference either to a numbers table, or a number sequence generator*/
WHERE
number BETWEEN 1 AND ((SELECT MAX(row_group_num) * (5 + 1) FROM base_data))
)
SELECT
ref_dcp_key
,group_booking_sum
,group_booking_count
,zero_value_column
,ROW_NUMBER() OVER (ORDER BY row_structure.row_group_num ASC, row_structure.group_line_num ASC) AS final_order
FROM
row_structure
LEFT JOIN
base_data
ON (base_data.row_group_nun = row_structure.row_group_num)
AND (base_data.group_line_num = row_structure.group_line_num)
ORDER BY
final_order