merge several records with the same call_id into one - oracle

Question

There is a table_verif table where I need to insert data, here is an example of fields and records for this table:
call_id | datetime | process_name | param_1 | param_2 | param_3 | param_ 4 |
------------------------------------------------------------------------------------------
1234567 | 29.12.2022| verification process | greeting| presentation | result | waiting |
---------------------------------------------------------------------------------------
And there is my table my_table with entries:
call_id | datetime | process_name | param_1 |
--------------------------------------------------------------
1234567 | 29.12.2022 | complaints | Establishing contact |
--------------------------------------------------------------
1234567 | 29.12.2022 | complaints | Identification |
--------------------------------------------------------------
1234567 | 29.12.2022 | complaints | Num specification |
--------------------------------------------------------------
1234567 | 29.12.2022 | complaints | Data transfer |
I need to translate these four records into a table_verif format:
call_id| datetime |process_name| param_1 | param_2 | param_3 | param_4
--------------------------------------------------------------------------------------------
1234567|29.12.2022|complaints |Establishing contact|Identification|Num specification|Data transfer
I took it shortly to param_4, but in practice it starts with param_1 and ends with ..param_9

Answer 1

You can pivot a result set (more explanation here), but you need to have a value to pivot on and provide the ordering for the result. For example you could start with a query like:
select call_id, datetime, process_name, param_1,
-- establish some ranking - use your own criteria
row_number() over (partition by call_id, process_name order by datetime, param_1) as rn
from my_table
which with the sample data plus reverse-engineered data from your example table_verif row might produce:
CALL_ID
DATETIME
PROCESS_NAME
PARAM_1
RN
1234567
29-DEC-22
complaints
Data transfer
1
1234567
29-DEC-22
complaints
Establishing contact
2
1234567
29-DEC-22
complaints
Identification
3
1234567
29-DEC-22
complaints
Num specification
4
1234567
29-DEC-22
verification process
greeting
1
1234567
29-DEC-22
verification process
presentation
2
1234567
29-DEC-22
verification process
result
3
1234567
29-DEC-22
verification process
waiting
4
You may have different criteria to decide the parameter order, perhaps from a look-up table you haven't shown. However you get it, once you have a generated value like rn you can use that for the pivot:
select *
from (
select call_id, datetime, process_name, param_1,
-- establish some ranking - use your own criteria
row_number() over (partition by call_id, process_name order by datetime, param_1) as rn
from my_table
)
pivot (
max(param_1)
for (rn) in (1 as param_1, 2 as param_2, 3 as param_3, 4 as param_4, 5 as param_5)
)
CALL_ID
DATETIME
PROCESS_NAME
PARAM_1
PARAM_2
PARAM_3
PARAM_4
PARAM_5
1234567
29-DEC-22
complaints
Data transfer
Establishing contact
Identification
Num specification
null
1234567
29-DEC-22
verification process
greeting
presentation
result
waiting
null
fiddle
You can then use that as an insert ... select ... statement to populate table_verif, or if this is permanent data then you can turn the query into a view instead of duplicating it.
You could also pivot by listing all the possible param_1 values in the in() clause instead of generating a ranking value, but that would give you a much wider result, and doesn't seem to be what you want here.