Pivot with Date and time - sql

Question

I have this query for Employee's fingerprints
SELECT
bp.Name
vahruae_date date,
to_char(vahruae_timeofattendance, 'hh:mi') Time
FROM vahruae_hr_empattendancelog empl
INNER JOIN c_bpartner bp ON empl.vahruae_enroll_id = bp.enroll_id
And the value displays as follows
Name Date Time
-----------------------------------------
John 01-SEP-2022 1:00
John 01-SEP-2022 9:00
John 01-SEP-2022 13:00
John 01-SEP-2022 16:00
John 02-SEP-2022 1:00
John 02-SEP-2022 6:00
John 04-SEP-2022 5:00
. .
. .
John 31-SEP-2022 4:30
John 31-SEP-2022 7:00
Ali 01-SEP-2022 10:00
Ali 04-SEP-2022 5:00
. .
. .
I want to display all times in one date row, like this
Name Date Time1 Time2 Time3 Time4
-----------------------------------------------------------------------------------------------
John 01-SEP-2022 1:00 9:00 13:00 16:00
John 02-SEP-2022 1:00 6:00 (null) (null)
John 04-SEP-2022 5:00 (null) (null) (null)
John 31-SEP-2022 4:30 7:00 (null) (null)
Ali 01-SEP-2022 10:00 (null) (null) (null)
Ali 05-SEP-2022 5:00 (null) (null) (null)
I'm not very good with Pivot, but I know I cannot use a subquery inside the Pivot IN Clause.
How can I accomplish that?

Answer 1

Use the ROW_NUMBER analytic function to index the times within a sub-query and then PIVOT using that:
SELECT name,
dt,
time1,
time2,
time3,
time4
FROM (
SELECT empl.vahruae_enroll_id,
bp.Name,
vahruae_date AS dt,
to_char(vahruae_timeofattendance, 'hh:mi') AS Time,
ROW_NUMBER() OVER (
PARTITION BY empl.vahruae_enroll_id,
vahruae_date,
TRUNC(vahruae_timeofattendance)
ORDER BY vahruae_timeofattendance
) AS rn
FROM vahruae_hr_empattendancelog empl
INNER JOIN c_bpartner bp
ON empl.vahruae_enroll_id = bp.enroll_id
)
PIVOT (
MAX(time)
FOR rn IN (1 AS time1, 2 AS time2, 3 AS time3, 4 AS time4)
)

Answer 2

We need to number the hours by date and name using row_number() and then pivoting.
select *
from
(
select "Name" as "Name"
,to_char("Date", 'hh24:mi') as "Time"
,to_date(to_char("Date", 'DD-mon-YYYY')) as "Date"
,row_number() over(partition by "Name", to_char("Date", 'DD-mon-YYYY') order by to_char("Date", 'hh24:mi')) as rn
from t
) t
pivot(max("Time") for rn in('1' as Time1, '2' as Time2, '3' as Time3, '4' as Time4)) p
order by "Name" desc, "Date"
Name
Date
TIME1
TIME2
TIME3
TIME4
John
01-SEP-22
01:00
09:00
13:00
16:00
John
02-SEP-22
01:00
06:00
null
null
John
04-SEP-22
05:00
null
null
null
John
01-OCT-22
04:30
07:00
null
null
Ali
01-SEP-22
10:00
null
null
null
Ali
04-SEP-22
05:00
null
null
null
Fiddle