AR - How to Combine the AR Aging Reports of 2 companies in one SQL?

Question

Hi!
I just completed a query which mimics the Official Aged Analysis of Debtors in SAP B1 8.8, and it works well.
Now I want to combine 2 companies in a single Query. Is this possible, and how can this be done?
Why do I need this?
I work for 2 related companies dealing with different product lines and each company maintains SAP B1 separately.
The 2 companies have the same clients, and send their own separate invoices. But our clients do not recognize this internal division: They make a single order for their purchases and settle their debts by a single remittance.
It would be useful to have an Aging which groups the results of both companies.
I know the names of the 2 databases, say Comp1 and Comp2.
I tried this clause: USE Comp1   GO, but query gives error message "Incorrect syntax near GO"
My idea is group the 2 databases in a single query and use UNION ALL, for example:
USE Comp1
GO
SELECT .....etc
UNION ALL
USE Comp2
GO
SELECT ... etc..
Is this the correct way to proceed? If not, could you tell me what is the best way to develop the query?
Here is a simplified version of my query
SELECT
T1.CardCode + '' AS 'BP Code',
T2.Notes2 AS 'BP Name',
T0.RefDate,
CASE
     WHEN T0.TransType = 13 THEN 'IN'
     WHEN T0.TransType = 14 THEN 'CN'
     WHEN T0.TransType = 30 THEN 'JE'
     WHEN T0.TransType = 24 THEN 'RC'
     WHEN T0.TransType = 46 THEN 'PS'
     ELSE 'Error ! ! !'
END AS 'Doc Type',
T0.Ref1 'Doc. Number',
ISNULL(T0.FCCurrency, ' - ') AS 'Ccy',
(T0.BalFcDeb - T0.BalFcCred) AS 'Bal. F. Ccy',
(T0.BalDueDeb - T0.BalDueCred) AS 'Bal. Rs',
ISNULL((SELECT T0.BalDueDeb -T0.BalDueCred WHERE DateDiff(mm, T0.RefDate, '[%1]') <= -1)                     ,0) AS 'Future',
ISNULL((SELECT T0.BalDueDeb -T0.BalDueCred WHERE DateDiff(mm, T0.RefDate, '[%1]') = 0)                         ,0) AS 'Current Mth',
ISNULL((SELECT T0.BalDueDeb -T0.BalDueCred WHERE DateDiff(mm, T0.RefDate, '[%1]') = 1)                         ,0) AS '1 Mth Ago',
ISNULL((SELECT T0.BalDueDeb -T0.BalDueCred WHERE DateDiff(mm, T0.RefDate, '[%1]') = 2)                         ,0) AS '2 Mth Ago',
ISNULL((SELECT T0.BalDueDeb -T0.BalDueCred WHERE DateDiff(mm, T0.RefDate ,'[%1]') = 3)                         ,0) AS '3 Mth Ago',
ISNULL((SELECT T0.BalDueDeb -T0.BalDueCred WHERE DateDiff(mm, T0.RefDate, '[%1]') between 4 and 6)    ,0) AS '4 - 6 Mth Ago',
ISNULL((SELECT T0.BalDueDeb -T0.BalDueCred WHERE DateDiff(mm, T0.RefDate, '[%1]') >= 7)                       ,0) AS '>7 Mth Ago'
FROM JDT1 T0
INNER JOIN OCRD T1 ON T0.ShortName = T1.CardCode
LEFT OUTER JOIN OCPR T2 ON T1.CardCode = T2.Cardcode
LEFT OUTER JOIN OJDT T3 ON T0.TransID = T3.TransID
LEFT OUTER JOIN OINV  T4 ON T3.TransID = T4.TransID
LEFT OUTER JOIN ORIN  T5 ON T3.TransID = T5.TransID
WHERE
T1.CardType = 'C' and Balance != 0
and (T0.BalDueDeb - T0.BalDueCred) != 0

Answer 1

Hi Gordon,
Do you mean the following?
Instead of writing:
SELECT ...
FROM JDT1 T0
I should write
SELECT...
FROM Company1.dbo.JDT1 T0
UNION
SELECT...
FROM Company2.dbo.JDT1 T5
I shall try it tomorrow morning when I return to Office.
Thanks a lot
Leon Lai