Oracle Pivot Help based on Data - sql

Question

I am trying use a oracle pivot function to display the data in below format. I have tried to use examples I found stackoverflow, but I am unable to achieve what I am looking.
With t as
(
select 1335 as emp_id, 'ADD Insurance New' as suuid, sysdate- 10 as startdate, null as enddate from dual
union all
select 1335 as emp_id, 'HS' as suuid, sysdate- 30 as startdate, null as enddate from dual
union all
select 1335 as emp_id, 'ADD Ins' as suuid, sysdate- 30 as startdate, Sysdate - 10 as enddate from dual
)
select * from t
output:
+--------+-------------------+-------------------+---------+-------------------+
| EMP_ID | SUUID_1 | SUUID_1_STARTDATE | SUUID_2 | SUUID_2_STARTDATE |
+--------+-------------------+-------------------+---------+-------------------+
| 1335 | ADD Insurance New | 10/5/2020 15:52 | HS | 9/15/2020 15:52 |
+--------+-------------------+-------------------+---------+-------------------+
Can anyone suggest to how to use SQL Pivot to get this format?

Answer 1

You can use conditional aggregation. There is more than one way to understand your question, but one approach that would work for your sample data is:
select emp_id,
max(case when rn = 1 then suuid end) suuid_1,
max(case when rn = 1 then startdate end) suid_1_startdate,
max(case when rn = 2 then suuid end) suuid_2,
max(case when rn = 2 then startdate end) suid_2_startdate
from (
select t.*, row_number() over(partition by emp_id order by startdate desc) rn
from t
where enddate is null
) t
group by emp_id
Demo on DB Fiddle:
EMP_ID | SUUID_1 | SUID_1_STARTDATE | SUUID_2 | SUID_2_STARTDATE
-----: | :---------------- | :--------------- | :------ | :---------------
1335 | ADD Insurance New | 05-OCT-20 | HS | 15-SEP-20

Answer 2

You can do it with PIVOT:
With t ( emp_id, suuid, startdate, enddate ) as
(
select 1335, 'ADD Insurance New', sysdate- 10, null from dual union all
select 1335, 'HS', sysdate- 30, null from dual union all
select 1335, 'ADD Ins', sysdate- 30, Sysdate - 10 from dual
)
SELECT emp_id,
"1_SUUID" AS suuid1,
"1_STARTDATE" AS suuid_startdate1,
"2_SUUID" AS suuid2,
"2_STARTDATE" AS suuid_startdate2
FROM (
SELECT t.*,
ROW_NUMBER() OVER ( ORDER BY startdate DESC, enddate DESC NULLS FIRST )
AS rn
FROM t
)
PIVOT (
MAX( suuid ) AS suuid,
MAX( startdate ) AS startdate,
MAX( enddate ) AS enddate
FOR rn IN ( 1, 2 )
)
Outputs:
EMP_ID | SUUID1 | SUUID_STARTDATE1 | SUUID2 | SUUID_STARTDATE2
-----: | :---------------- | :--------------- | :----- | :---------------
1335 | ADD Insurance New | 05-OCT-20 | HS | 15-SEP-20
db<>fiddle here