Query to Get all Row Combinations - tsql

Question

I want a query to retrive all row combinations from the below data set
This is my original Dataset.
SId Sequence RId
2976 1 100
4576 1 100
19472 1 100
80591 1 100
58811 1 100
70859 1 100
170941 2 100
167578 2 100
131885 2 100
117608 2 100
78117 1 101
69481 1 101
70987 2 101
46857 2 101
28396 2 101
From this data set I want the result based on RId and combination of each sequence of 1 and 2.
So For the above case for RId 100 there should be 24 combinations like
the below data:
RSId Sid Sequence RId
1 2976 1 100
1 170941 2 100
2 2976 1 100
2 167578 2 100
3 2976 1 100
3 131885 2 100
the below is the input table format
CREATE TABLE #temp ( SId INT,Sequence INT,Rid INT)
INSERT into #temp values (2976,1,100)
insert into #temp values (4576,1,100)
insert into #temp values (19472,1,100)
insert into #temp values (80591,1,100)
insert into #temp values (58811,1,100)
insert into #temp values (70859,1,100)
insert into #temp values (170941,2,100)
insert into #temp values (167578,2,100)
insert into #temp values (131885,2,100)
insert into #temp values (117608,2,100)
insert into #temp values (78117,1,101)
insert into #temp values (69481,1,101)
insert into #temp values (70987,2,101)
insert into #temp values (46857,2,101)
insert into #temp values (28396,2,101)
SELECT * FROM #Temp
the result should be of the below table format:
RSId Sid Sequence RId
1 2976 1 100
1 170941 2 100
2 2976 1 100
2 167578 2 100
3 2976 1 100
3 131885 2 100
4 2976 1 100
4 117608 2 100
5 4576 1 100
5 170941 2 100
6 4576 1 100
6 167578 2 100
7 4576 1 100
7 131885 2 100
8 4576 1 100
8 117608 2 100
9 19472 1 100
9 170941 2 100
10 19472 1 100
10 167578 2 100
11 19472 1 100
11 131885 2 100
12 19472 1 100
12 117608 2 100
13 80591 1 100
13 170941 2 100
14 80591 1 100
14 167578 2 100
15 80591 1 100
15 131885 2 100
16 80591 1 100
16 117608 2 100
17 58811 1 100
17 170941 2 100
18 58811 1 100
18 167578 2 100
19 58811 1 100
19 131885 2 100
20 58811 1 100
20 117608 2 100
21 70859 1 100
21 117608 2 100
22 70859 1 100
22 170941 2 100
23 70859 1 100
23 167578 2 100
24 70859 1 100
24 131885 2 100

Answer 1

One way to do it is to use common table expressions, cross join and union.
It might be a bit cumbersome but it should have pretty good performance:
DECLARE #Rid int = 100;
With cte1 As
(
SELECT SID, Sequence, Rid
FROM #Temp
WHERE Sequence = 1
AND Rid = #Rid
), cte2 AS
(
SELECT SID, Sequence, Rid
FROM #Temp
WHERE Sequence = 2
AND Rid = #Rid
), cteCJ AS
(
SELECT Cte1.Sid As Sid1, Cte1.Sequence As Seq1, Cte1.Rid As Rid,
Cte2.Sid As Sid2, Cte2.Sequence As Seq2,
ROW_NUMBER() OVER(ORDER BY Cte1.Sid) As RSId
FROM Cte1
CROSS JOIN Cte2
)
SELECT RSId, Sid1 As Sid, Seq1 As Sequence, Rid
FROM cteCJ
UNION
SELECT RSId, sid2, Seq2, Rid
FROM cteCJ
ORDER BY RSId, Seq1
Results:
RSId Sid Sequence Rid
1 2976 1 100
1 170941 2 100
2 2976 1 100
2 167578 2 100
3 2976 1 100
3 131885 2 100
4 2976 1 100
4 117608 2 100
5 4576 1 100
5 170941 2 100
6 4576 1 100
6 167578 2 100
7 4576 1 100
7 131885 2 100
8 4576 1 100
8 117608 2 100
9 19472 1 100
9 170941 2 100
10 19472 1 100
10 167578 2 100
11 19472 1 100
11 131885 2 100
12 19472 1 100
12 117608 2 100
13 58811 1 100
13 170941 2 100
14 58811 1 100
14 167578 2 100
15 58811 1 100
15 131885 2 100
16 58811 1 100
16 117608 2 100
17 70859 1 100
17 170941 2 100
18 70859 1 100
18 167578 2 100
19 70859 1 100
19 131885 2 100
20 70859 1 100
20 117608 2 100
21 80591 1 100
21 170941 2 100
22 80591 1 100
22 167578 2 100
23 80591 1 100
23 131885 2 100
24 80591 1 100
24 117608 2 100