Linking Related IDs together through two other ID columns - sql

Question

I have a table of about 100k rows with the following layout:
+----+-----------+------------+-------------------+
| ID | PIN | RAID | Desired Output ID |
+----+-----------+------------+-------------------+
| 1 | 80602627 | 1737852-1 | 1 |
| 2 | 80602627 | 34046655-1 | 1 |
| 3 | 351418172 | 33661 | 2 |
| 4 | 351418172 | 33661 | 2 |
| 5 | 351418172 | 33661 | 2 |
| 6 | 351418172 | 34443321-1 | 2 |
| 7 | 491863017 | 26136 | 3 |
| 8 | 491863017 | 34575 | 3 |
| 9 | 491863017 | 34575 | 3 |
| 10 | 661254727 | 26136 | 3 |
| 11 | 661254727 | 26136 | 3 |
| 12 | NULL | 7517 | 4 |
| 13 | NULL | 7517 | 4 |
| 14 | NULL | 7517 | 4 |
| 15 | NULL | 7517 | 4 |
| 16 | NULL | 7517 | 4 |
| 17 | 554843813 | 33661 | 2 |
| 18 | 554843813 | 33661 | 2 |
+----+-----------+------------+-------------------+
The ID column has unique values, with the PIN and RAID columns being two separate identifying numbers used to group linked IDs together. The Desired Output ID column is what I would like SQL to do, essentially looking at both the PIN and RAID columns to spot where there are any relationships between them.
So for example Where Desired Output ID = 2, IDs 3-6 match on PIN = 351418172, and then IDs 17-18 also match as the RAID of 33661 was in the rows for IDs 3-5.
To add as well, NULLs will be in the PIN Column but not in any others.
I did spot a similar question Text however as it is in BigQuery I wasnt sure it would help.
Have been trying to crack this one for a while with no luck, any help massively appreciated.

Answer 1

I suppose DENSE_RANK can solve your problem. Not sure what the combination of PIN and RAID should be, but I think you'll be able to figure it out how to do it like this:
SELECT *,DENSE_RANK( ) over (ORDER BY isnull(pin,id) ),DENSE_RANK( ) over (ORDER BY raid)
FROM accounts

Answer 2

I believe I have found a bit of a bodged solution to this. It runs very slowly as it goes row by row and will only go two links deep on PIN/RAID, but this should be sufficient for 99%+ cases.
Would appreciate any suggestions to speeding it up if anything is immediately obvious.
ID in post above is DebtorNo in Code:
DECLARE #Counter INT = 1
DECLARE #EndCounter INT = 0
IF OBJECT_ID('Tempdb..#OrigACs') IS NOT NULL
BEGIN
DROP TABLE #OrigACs
END
SELECT DebtorNo,
Name,
PostCode,
DOB,
RAJoin,
COALESCE(PIN,DebtorNo COLLATE DATABASE_DEFAULT) AS PIN,
RelatedAssets,
RAID,
PINRelatedAssets
INTO #OrigACs
FROM MIReporting..HC_RA_Test_Data RA
IF OBJECT_ID('Tempdb..#Accounts') IS NOT NULL
BEGIN
DROP TABLE #Accounts
END
SELECT *,
ROW_NUMBER() OVER (ORDER BY CAST(RA.DebtorNo AS INT)) AS Row
INTO #Accounts
FROM #OrigACs RA
ORDER BY CAST(RA.DebtorNo AS INT)
CREATE INDEX Temp_HC_Index ON #OrigACs (RAID,PIN)
SET #EndCounter = (SELECT MAX(Row) FROM #Accounts)
WHILE #Counter <= #EndCounter
BEGIN
IF OBJECT_ID('Tempdb..#RAID1') IS NOT NULL
BEGIN
DROP TABLE #RAID1
END
SELECT *
INTO #RAID1
FROM #OrigACs A
WHERE A.RAID IN (SELECT RAID FROM #Accounts WHERE [Row] = #Counter)
IF OBJECT_ID('Tempdb..#PIN1') IS NOT NULL
BEGIN
DROP TABLE #PIN1
END
SELECT *
INTO #PIN1
FROM #OrigACs A
WHERE A.PIN IN (SELECT PIN FROM #RAID1)
IF OBJECT_ID('Tempdb..#RAID2') IS NOT NULL
BEGIN
DROP TABLE #RAID2
END
SELECT *
INTO #RAID2
FROM #OrigACs A
WHERE A.RAID IN (SELECT RAID FROM #PIN1)
IF OBJECT_ID('Tempdb..#PIN2') IS NOT NULL
BEGIN
DROP TABLE #PIN2
END
SELECT *
INTO #PIN2
FROM #OrigACs A
WHERE A.PIN IN (SELECT PIN FROM #RAID2)
INSERT INTO MIReporting..HC_RA_Final_ACs
SELECT DebtorNo,
Name,
PostCode,
DOB,
RAJoin,
CASE
WHEN PIN = DebtorNo COLLATE DATABASE_DEFAULT THEN NULL
ELSE PIN
END AS PIN,
RelatedAssets,
RAID,
PINRelatedAssets,
COALESCE((SELECT MAX(FRAID) FROM MIReporting..HC_RA_Final_ACs),0) + 1 AS FRAID
FROM #PIN2
SET #Counter = (SELECT MIN([ROW]) FROM #Accounts O WHERE O.DebtorNo NOT IN (SELECT DebtorNo FROM MIReporting..HC_RA_Final_ACs));
END;
SELECT *
FROM MIReporting..HC_RA_Final_ACs
DROP TABLE #OrigACs
DROP TABLE #Accounts
DROP TABLE #RAID1
DROP TABLE #PIN1
DROP TABLE #RAID2
DROP TABLE #PIN2