SQL Server : row over - sql-server

Question

I have two tables one that maintain the assets and the other which maintains the sub assets:
Table 1: assethdr
assetid
0000000002
0000000003
and
Table 2: assetdet
assetsubid assetid
0000000001 0000000002
0000000002 0000000002
0000000003 0000000002
0000000001 0000000003
0000000001 0000000109
0000000002 0000000109
0000000003 0000000109
0000000004 0000000109
0000000005 0000000109
I did this query:
WITH cte_assets
as
(SELECT
CASE WHEN ROW_NUMBER() OVER(PARTITION BY h.assetid ORDER BY f.assetsubid) = 1
THEN 'BA-'+LTRIM(RTRIM(h.CpnyId))+'-'+right(LTRIM(h.AssetId),5)+'-'+'0001' ELSE '' END as [Business Asset Number]
, 'BA'+
+'-'+RIGHT(LTRIM(RTRIM(ltrim(rtrim(f.cpnyid)))),3)
+'-'+
RIGHT(f.assetid,5)+'-'+RIGHT(f.assetsubid,4)as [Component Asset ID*]
FROM pssfaassets f
INNER JOIN PSSFAAssetsHdr h
ON f.AssetId=h.assetid
AND h.AssetId LIKE '%0000000002'
--GROUP BY h.cpnyid,h.AssetId,f.AssetSubId
)
SELECT * FROM cte_assets
WHERE [Business Asset Number]<>[Component Asset ID*]
ORDER BY [Component Asset ID*],[Business Asset Number]
but I don't get the right result, which should be :
Rownum Business Asset Number rownum2 Component Asset ID*
1 BA-613-00002-0001 1 BA-613-00002-0002
1 2 BA-613-00002-0003
2 BA-607-00109-001 1 BA-607-00109-0002
2 2 BA-607-00109-0003
2 3 BA-607-00109-0004
2 4 BA-607-00109-0005

Answer 1

Lets make some test data: I added the cpnyid (guessing based on your output) for both the header and detail records.
DECLARE #assethdr TABLE
(
assetid varchar(20),
CpnyId varchar(20)
)
INSERT INTO #assethdr
( assetid, CpnyId )
VALUES
('0000000002', '613'),
('0000000003', '605'),
('0000000109', '607');
DECLARE #assetdet TABLE
(
assetsubid varchar(20),
assetid varchar(20),
CpnyId varchar(20)
);
INSERT INTO #assetdet
( assetsubid, assetid, CpnyId )
VALUES
('0000000001', '0000000002', '613'),
('0000000002', '0000000002', '613'),
('0000000003', '0000000002', '613'),
('0000000001', '0000000003', '605'),
('0000000001', '0000000109', '607'),
('0000000002', '0000000109', '607'),
('0000000003', '0000000109', '607'),
('0000000004', '0000000109', '607'),
('0000000005', '0000000109', '607');
The query is similar, but I added the row number to the output:
WITH cte_assets
as
(SELECT
ROW_NUMBER() OVER (PARTITION BY h.assetid ORDER BY f.assetsubid) AS RN,
CASE WHEN ROW_NUMBER() OVER(PARTITION BY h.assetid ORDER BY f.assetsubid) = 2
THEN 'BA-'+LTRIM(RTRIM(h.CpnyId))+'-'+right(LTRIM(h.AssetId),5)+'-'+'0001' ELSE '' END as [Business Asset Number]
, 'BA'+
+'-'+RIGHT(LTRIM(RTRIM(ltrim(rtrim(f.cpnyid)))),3)
+'-'+
RIGHT(f.assetid,5)+'-'+RIGHT(f.assetsubid,4)as [Component Asset ID*]
FROM #assetdet f
INNER JOIN #assethdr h
ON f.AssetId=h.assetid
--AND h.AssetId LIKE '%0000000002'
--GROUP BY h.cpnyid,h.AssetId,f.AssetSubId
)
Now with the addition of the row number, you are trying to bypass the first match it seems (from your expected output):
SELECT (RN - 1) AS RowNum, [Business Asset Number], [Component Asset ID*]
FROM cte_assets
WHERE [RN] != 1
ORDER BY [Component Asset ID*],[Business Asset Number]
Here is the output:
RowNum Business Asset Number Component Asset ID*
1 BA-607-00109-0001 BA-607-00109-0002
2 BA-607-00109-0003
3 BA-607-00109-0004
4 BA-607-00109-0005
1 BA-613-00002-0001 BA-613-00002-0002
2 BA-613-00002-0003