Oracle SQL - Create identifier for couple of values - sql

Question

I'm struggling with the following problem, I have the follwing data in a table:
Param ID
Param Val
Other Cols
1
15
XXX
1
15
XXX
1
16
XXX
1
16
XXX
2
21
XXX
2
21
XXX
2
22
XXX
2
22
XXX
I would like to select a new colum in order to create 4 sets of data to have all the possible combination between the values of parameter 1 and 2; so I would like to obtain something like this:
Set
Param ID
Param Val
Other Cols
1
1
15
XXX
2
1
15
XXX
3
1
16
XXX
4
1
16
XXX
1
2
21
XXX
3
2
21
XXX
2
2
22
XXX
4
2
22
XXX
So for example for the Set 1 I will have the Couple of values 15 and 21, for the set 2 the values 15 and 22 etc etc.
I tried using different analytic functions, but I was not able to have what I need.
Thanks in advance.

Answer 1

Despite a good hint on the MODEL clause, I guess I will go for a solution combining cross join and unpivot, maybe it is not the best, but it fit my needs.
WITH tbl AS
(
Select 1 "ID", 15 "VAL" From Dual Union All
Select 1 "ID", 16 "VAL" From Dual Union All
Select 2 "ID", 21 "VAL" From Dual Union All
Select 2 "ID", 22 "VAL" From Dual )
SELECT *
FROM (
SELECT ROWNUM AS SET_ID,
id1,
id4
FROM (
SELECT
CASE a.id
WHEN 1 THEN a.val
ELSE 0
END AS id1,
CASE a.id
WHEN 2 THEN a.val
ELSE 0
END AS id2,
CASE b.id
WHEN 1 THEN b.val
ELSE 0
END AS id3,
CASE b.id
WHEN 2 THEN b.val
ELSE 0
END AS id4
FROM tbl a,
tbl b)
WHERE id2 = 0
AND id3 = 0) UNPIVOT (VAL FOR ID IN (id1 AS '1',
id4 AS '2'))
that results in :
SET_ID
ID
VAL
1
1
15
1
2
21
2
1
15
2
2
22
3
1
16
3
2
21
4
1
16
4
2
22
tried with all the combination of source data, and it seems work :)

Answer 2

Sample data:
WITH
tbl AS
(
Select 1 "ID", 15 "VAL" From Dual Union All
Select 1 "ID", 15 "VAL" From Dual Union All
Select 1 "ID", 16 "VAL" From Dual Union All
Select 1 "ID", 16 "VAL" From Dual Union All
Select 2 "ID", 21 "VAL" From Dual Union All
Select 2 "ID", 21 "VAL" From Dual Union All
Select 2 "ID", 22 "VAL" From Dual Union All
Select 2 "ID", 22 "VAL" From Dual
)
UPDATED AFTER THE COMMENT
If you want the combinations then you will have to use the MODEL clause. To do that you should prepare the data (cte named grid) a bit so you could do the addressing to the particular data and manage all the combinations you want. It looks like here:
grid AS
( Select Distinct
Sum(1) OVER(Partition By ID Order By ID ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) "IDS_TOTAL_ORDER",
Sum(1) OVER(Partition By VAL Order By VAL ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) "VALS_TOTAL_ORDER",
ID "ID",
VAL "VAL"
From
tbl
Order By ID
)
Select SET_ID, ID, VAL
From ( Select 0 "SET_ID", IDS_TOTAL_ORDER, VALS_TOTAL_ORDER, ID "ID", VAL "VAL"
From grid
)
MODEL
Dimension By (ID, IDS_TOTAL_ORDER, VALS_TOTAL_ORDER)
Measures(SET_ID, VAL)
RULES
(
SET_ID[1, ANY, ANY] = CV(IDS_TOTAL_ORDER),
SET_ID[2, 1, 1] = CV(IDS_TOTAL_ORDER),
SET_ID[2, 2, 2] = CV(IDS_TOTAL_ORDER) + 1,
SET_ID[2, 3, 1] = CV(IDS_TOTAL_ORDER) - 1,
SET_ID[2, 4, 2] = CV(IDS_TOTAL_ORDER)
)
Order By ID, IDS_TOTAL_ORDER
This way you can get any combination. Here is your result:
SET_ID
ID
VAL
1
1
15
2
1
15
3
1
16
4
1
16
1
2
21
3
2
21
2
2
22
4
2
22
More about MODEL clause: https://www.oracle.com/webfolder/technetwork/tutorials/obe/db/10g/r2/prod/bidw/sqlmodel/sqlmodel_otn.htm
Sets now looks like here:
SET_ID
IDS_VALS
1
1/15, 2/21
2
1/15, 2/22
3
1/16, 2/21
4
1/16, 2/22
Regards...