Nested notExists joins X++ (Dynamics AX3.0)

问题

When the following code executes:

   select sum(qty) from inventTrans
        index hint TransTypeIdx
        where inventTrans.ItemId        == itemId
           && inventTrans.TransType     == InventTransType::Sales
           && inventTrans.InventDimId   == inventDimId
        notExists join custTable
        where custTable.AccountNum      == inventTrans.CustVendAC
           && custTable.CustGroup       == custGroupId
        notExists join salesTable
        where salesTable.SalesId        == inventTrans.TransRefId
           && salesTable.Extraordinary  == NoYes::Yes;

The sql generated nests the second notExists join (salesTable) into the where clause of the first notExists join (custTable). ie

SELECT SUM(A.QTY)
FROM
    INVENTTRANS A
WHERE
    A.DATAAREAID  = 'MyCompany'
AND A.ITEMID      = 'MyItem'
AND A.TRANSTYPE   = 0
AND A.INVENTDIMID = 'SomeValue'
AND NOT EXISTS (SELECT 'x'
                FROM CUSTTABLE C
                WHERE C.DATAAREAID  ='MyCompany'
                AND C.ACCOUNTNUM    =A.CUSTVENDAC
                AND C.CUSTGROUP     ='SomeCustGroup'
                AND NOT EXISTS (SELECT 'x'
                                FROM SALESTABLE B
                                WHERE
                                    B.DATAAREAID    ='MyCompany'
                                AND B.SALESID       =A.TRANSREFID
                                AND B.EXTRAORDINARY =1))

Is there any way to write the X++ select query to notExists join the salesTable to the inventTrans table instead of the custTable, so the SQL generated would be similar to the following?

SELECT SUM(A.QTY)
FROM
    INVENTTRANS A
WHERE A.DATAAREAID     = 'MyCompany'
AND A.ITEMID           = 'MyItem'
AND A.TRANSTYPE        = 0
AND A.INVENTDIMID      = 'SomeValue'
AND NOT EXISTS (SELECT 'x'
                FROM CUSTTABLE C
                WHERE C.DATAAREAID  ='MyCompany'
                AND C.ACCOUNTNUM    =A.CUSTVENDAC
                AND C.CUSTGROUP     ='SomeCustGroup')
AND NOT EXISTS (SELECT 'x'
                FROM SALESTABLE B
                WHERE
                    B.DATAAREAID='MyCompany'
                AND B.SALESID=A.TRANSREFID
                AND B.EXTRAORDINARY=1)

回答1:

The short answer: no!

In your example, you could reformulate using inner join:

select sum(qty) from inventTrans
    index hint TransTypeIdx
    where inventTrans.ItemId        == itemId
       && inventTrans.TransType     == InventTransType::Sales
       && inventTrans.InventDimId   == inventDimId
    join salesTable
    where salesTable.SalesId        == inventTrans.TransRefId
       && salesTable.Extraordinary  == NoYes::No;
    notExists join custTable
    where custTable.AccountNum      == inventTrans.CustVendAC
       && custTable.CustGroup       == custGroupId

It should work provided you do not delete sales orders when invoicing.

回答2:

You're probably not waiting for an answer anymore, but on Ax 2012 I still experienced the same problem.

Found another solution (aside from using a SQL Statement), not the most performant one, but it works:

Create a query: select * from inventTrans notexists join CustTable ....
Create a view based on that query
do the same for the salesTable
change your select statement as follows:

select inventTrans

...

exists join myCustView

where myCustView.InventTransRecId == inventTrans.RecId

exists join mySalesView

where ...

Hope this helps,

来源：https://stackoverflow.com/questions/514449/nested-notexists-joins-x-dynamics-ax3-0

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x++