Oracle Shuffle columns in rows - oracle

Question

Based in the solution if this issue - Shuffle a column between rows - I need to apply to this, a new condition: the names must guarantee the gender: male, female or unknown.
So, my table have a column named gender. I need to shuffle the columns whit the same gender.
I've tried this, but in some cases I cannot guarantee the gender
merge into original_table o
using (
with
helper ( id, gender, rn, rand_rn ) as (
select id,
gender,
row_number() over (order by id),
row_number() over (order by dbms_random.value())
from original_table
)
select ot.name, ot.gender, h2.id
from original_table ot inner join helper h1 on (ot.id = h1.id and ot.gender = h1.gender)
inner join helper h2 on h1.rand_rn = h2.rn
) p
on (o.id = p.id)
when matched then update set o.name = p.name
;
And in cases that gender is not available (is null value), for example company's name, this merge not update anything.
I can split this query in 3 different merge statement. One for each gender that I have. But I'm looking for a better and simply statement. Because I need to apply the same solution in a different context and with different conditions.
Thanks.
EDIT: Sample data
ID GENDER NAME
3721 M MARK
3722 M JUSTIN
3723 F RUTH
3724 F MARY
3725 F ANNE
4639 CAMPANY SA
4640 M JOHN
4641 M LUCAS
4642 COMPANY HOLDER SA
One possible solution:
ID GENDER NAME
3721 M LUCAS
3722 M JOHN
3723 F MARY
3724 F ANNE
3725 F RUTH
4639 CAMPANY HOLDER SA
4640 M MARK
4641 M JUSTIN
4642 COMPANY SA

Answer 1

Include gender in the PARTITION BY clause in the analytic functions and in the JOIN clause. If you don't have a primary key to match on then you could use the ROWID pseudo-column.
Oracle Setup:
CREATE TABLE original_table ( id, gender, name, company ) AS
SELECT 1, 'F', 'Alice', CAST( NULL AS VARCHAR2(20) ) FROM DUAL UNION ALL
SELECT 2, 'M', 'Bobby', 'ACME' FROM DUAL UNION ALL
SELECT 3, 'F', 'Carol', 'XYZ' FROM DUAL UNION ALL
SELECT 4, 'M', 'David', NULL FROM DUAL UNION ALL
SELECT 5, 'M', 'Errol', 'ACME' FROM DUAL UNION ALL
SELECT 6, 'F', 'Fiona', 'XYZ' FROM DUAL;
Update:
MERGE INTO original_table dst
USING (
WITH rnd ( rid, rn, rnd_rn, gender, name ) AS (
SELECT ROWID,
ROW_NUMBER() OVER ( PARTITION BY gender ORDER BY id ),
ROW_NUMBER() OVER ( PARTITION BY gender ORDER BY DBMS_RANDOM.VALUE ),
gender,
name
FROM original_table
)
SELECT o.rid, r.name
FROM rnd o INNER JOIN rnd r
ON ( ( o.gender = r.gender OR ( o.gender IS NULL AND r.gender IS NULL ) )
AND o.rn = r.rnd_rn )
)
ON ( dst.ROWID = src.ROWID )
WHEN MATCHED THEN
UPDATE SET name = src.name;
Output:
SELECT * FROM original_table;
ID G NAME COMPANY
-- - ----- -------
1 F Fiona
2 M David ACME
3 F Alice XYZ
4 M Bobby
5 M Errol ACME
6 F Carol XYZ