INNER JOIN with multiple tables and keys - sql-server

Question

Well, lets start.
I have 4 servers with the same database. There is a query that works fine to get data from each DB individually. Its something like this:
SELECT "blablablablabla"
FROM [UNION_ALL_BASES]..OVPM T01 with (nolock)
INNER JOIN [UNION_ALL_BASES]..VPM2 T11 with (nolock) ON T01.UnionAll_Empresa = T11.UnionAll_Empresa and T01.DocEntry = T11.DocNum
INNER JOIN [UNION_ALL_BASES]..PCH6 T2 with (nolock) ON T11.UnionAll_Empresa = T2.UnionAll_Empresa and T11.DocEntry = T2.DocEntry and T11.InstId = T2.InstlmntID
INNER JOIN [UNION_ALL_BASES]..OPCH T3 with (nolock) ON T2.UnionAll_Empresa = T3.UnionAll_Empresa and T2.DocEntry = T3.DocEntry
INNER JOIN [UNION_ALL_BASES]..PCH1 T3a with (nolock) ON T3.UnionAll_Empresa = T3a.UnionAll_Empresa and T3.DocEntry = T3a.DocEntry
LEFT JOIN [UNION_ALL_BASES]..OOCR T3b with (nolock) ON T3a.UnionAll_Empresa = T3b.UnionAll_Empresa and T3a.OcrCode2 = T3b.OcrCode
INNER JOIN [UNION_ALL_BASES]..OSLP T4 with (nolock) ON T4.UnionAll_Empresa = T4.UnionAll_Empresa and T3.SlpCode = T4.SlpCode
and T11.InvType = ''18''
AND T01.Canceled <> ''Y''
AND T01.CashSum > 0
Today we have one new database that merges all these 4 DBs. Each table of this new DB is a view with and Union All, with the difference that now I added a new column named "UnionAll_Empresa", to know from what server this row came from.
For example:
CREATE VIEW AACP as
SELECT 'G8Networks Solucoes' as UnionAll_Empresa, * from SBO_G8NETWORKS_SOLUCOES.dbo.AACP
UNION All
SELECT 'G8Networks NIC' as UnionAll_Empresa, * from SBO_G8NETWORKS_NIC.dbo.AACP
UNION All
SELECT 'SPIN' as UnionAll_Empresa, * from SBO_SPIN.dbo.AACP
UNION All
SELECT 'FA2R' as UnionAll_Empresa, * from SBO_FA2R.dbo.AACP;
Now I need to use that old query again, with these new "tables". The problem is that now the primary keys are not unique anymore, since there are 4 servers in the same table. So the solution would be to add the "UnionAll_Empresa" field (wich tells the name of the server) as a key along with the primary keys in the query. The new query would be something like this:
SELECT "blalalalalala"
FROM [UNION_ALL_BASES]..OVPM T01 with (nolock)
INNER JOIN [UNION_ALL_BASES]..VPM2 T11 with (nolock) ON T01.DocEntry = T11.DocNum and T01.UnionAll_Empresa = T11.UnionAll_Empresa
INNER JOIN [UNION_ALL_BASES]..PCH6 T2 with (nolock) ON T11.DocEntry = T2.DocEntry and T11.InstId = T2.InstlmntID and T11.UnionAll_Empresa = T2.UnionAll_Empresa
INNER JOIN [UNION_ALL_BASES]..OPCH T3 with (nolock) ON T2.DocEntry = T3.DocEntry and T2.UnionAll_Empresa = T3.UnionAll_Empresa
INNER JOIN [UNION_ALL_BASES]..PCH1 T3a with (nolock) ON T3.DocEntry = T3a.DocEntry and T3.UnionAll_Empresa = T3a.UnionAll_Empresa
LEFT JOIN [UNION_ALL_BASES]..OOCR T3b with (nolock) ON T3a.OcrCode2 = T3b.OcrCode and T3a.UnionAll_Empresa = T3b.UnionAll_Empresa
INNER JOIN [UNION_ALL_BASES]..OSLP T4 with (nolock) ON T3.SlpCode = T4.SlpCode and T4.UnionAll_Empresa = T4.UnionAll_Empresa
WHERE T11.InvType = ''18''
AND T01.Canceled <> ''Y''
AND T01.CashSum > 0
But it shows an error:
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
It stills find multiple results for some primary key, even when I add the comparison with the column "UnionAll_Empresa" (the name of the original server).
Am I doing something wrong?
--- Here is the full query
set #vQuery = '
SELECT --Pagametos de NF em dinheiro
T01.UnionAll_Empresa,
Base = ''' + #database + ''',
NomeEmp = (select a.CompnyName from [UNION_ALL_BASES]..OADM a with (nolock)),
CNPJ = (select a.TaxIdNum from [UNION_ALL_BASES]..oadm a with (nolock)),
IE = (Select TaxIdNum2 from [UNION_ALL_BASES]..OADM with (nolock)),
Filial = (Select PrintHeadr from [UNION_ALL_BASES]..OADM with (nolock)),
Proj = isnull(T3.Project,''''),
OcrCode2 = isnull(T3a.OcrCode2,''0''),
OcrName = isnull(T3b.OcrName,''Sem projeto definido''),
''NF'' TipoDoc,
''DIN'' Tipo,
T01.CardCode,
T01.CardName,
CardFName = (select CardFName from [UNION_ALL_BASES]..OCRD with (nolock) where OCRD.CardCode = T01.CardCode and OCRD.UnionAll_Empresa = T01.UnionAll_Empresa),
T01.DocEntry CodigoBaixaPagamento,
T11.DocEntry NumeroSapDocumento,
T01.DocDate DataDocBaixa,
T3.DocDate,
T11.InstId Parcela,
'''' SituacaoParc,
''1900-01-01'' DataUltBaixa,
T11.InvType,
T2.InsTotal ValorDaParcelaOriginal,
T01.DocDate DataLancamentoBaixa,
T2.DueDate VencimentoOriginalParcela,
T3.SeqCode,
SerieNF = (select SeqName from [UNION_ALL_BASES]..NFN1 with (nolock) where SeqCode = T3.SeqCode and UnionAll_Empresa = T3.UnionAll_Empresa),
T3.Series,
T3.Serial,
T3.SlpCode,
T4.SlpName,
round((T3a.LineTotal/T3.DocTotal)*(T11.SumApplied/T01.DocTotal)*(T01.CashSum),2) ValorPago,
T01.DocTotal TotalBaixa,
T01.CashSum TotalDinBaixa,
T01.TrsfrSum TotalTransfBaixa,
T01.[CheckSum] TotalCHBaixa,
T01.BoeSum TotalBoeBaixa,
T01.CreditSum TotalCCredBaixa,
Case
When T01.CashSum > 0 Then ''Dinheiro''
When T01.TrsFrSum > 0 Then ''Transferência''
When T01.CreditSum > 0 Then ''Cartao''
End TipoDocumento,
'''' NossoNumBol,
'''' DigNossoNumBol,
''1900-01-01'' VencBoleto,
'''' CodBancoBol,
'''' NomeBancoBol,
0 VlrTotBol,
'''' NomeFPagtoBol,
'''' LinhaDigBol,
'''' TrsfrRef,
'''' NumCH,
'''' DataCH,
'''' StatusCH,
0 VlrTotCH,
'''' BancoCH,
'''' AgenciaCH,
'''' ContaCH,
'''' BoeStatus,
'''' CodCCred,
'''' NomeCCred,
'''' NumComprCartao,
0 NumParcCartao,
''1900-01-01'' PrimVencimentoCartao,
0 VlrTotCartao,
VlrDin = round((T3a.LineTotal/T3.DocTotal)*(T11.SumApplied/T01.DocTotal) * T01.CashSum,2),
VlrTransf = 0,
VlrCredit = 0,
VlrBol = 0,
VlrCH = 0,
VlrCart = 0,
VlrDev = 0,
VlrBLI = 0
FROM [UNION_ALL_BASES]..OVPM T01 with (nolock)
INNER JOIN [UNION_ALL_BASES]..VPM2 T11 with (nolock) ON T01.DocEntry = T11.DocNum and T01.UnionAll_Empresa = T11.UnionAll_Empresa
INNER JOIN [UNION_ALL_BASES]..PCH6 T2 with (nolock) ON T11.DocEntry = T2.DocEntry and T11.InstId = T2.InstlmntID and T11.UnionAll_Empresa = T2.UnionAll_Empresa
INNER JOIN [UNION_ALL_BASES]..OPCH T3 with (nolock) ON T2.DocEntry = T3.DocEntry and T2.UnionAll_Empresa = T3.UnionAll_Empresa
INNER JOIN [UNION_ALL_BASES]..PCH1 T3a with (nolock) ON T3.DocEntry = T3a.DocEntry and T3.UnionAll_Empresa = T3a.UnionAll_Empresa
LEFT JOIN [UNION_ALL_BASES]..OOCR T3b with (nolock) ON T3a.OcrCode2 = T3b.OcrCode and T3a.UnionAll_Empresa = T3b.UnionAll_Empresa
INNER JOIN [UNION_ALL_BASES]..OSLP T4 with (nolock) ON T3.SlpCode = T4.SlpCode and T4.UnionAll_Empresa = T4.UnionAll_Empresa
WHERE T11.InvType = ''18''
AND T01.Canceled <> ''Y''
AND T01.CashSum > 0
'
exec ('insert into #RelContasPagar ' + #vQuery)

Answer 1

Am I doing something Wrong?
Here's a problem in one of your join conditions:
and T4.UnionAll_Empresa = T4.UnionAll_Empresa
T4 to T4!

Answer 2

I really feel this question is beyond me but I'll propose something we're doing on a data warehouse project I'm working on. In addition to the standard ID primary key that we have on each table, in a number of cases we've added an additional key that we call the BK (Business Key) that we try to ensure is unique. The usage is a little different from a standard ID key because the BK is a string that has business related information embedded in it. I could see you using it to have a 'pseudo' primary key that could also tell you which server was the source for the row of data you've retrieved.
This may seem lame but it's all I could come up with.