Gruppera rad efter summan av specifik kolumn lika med specifikt värde

Med en hjälptabell som definierar "Förfallen"-gränser placerad över källtabellen med löpande total beräknad, kan en skärningspunkt mellan varje löpande totalbelopp och "Förfallen"-gränserna beräknas:

With Receipt As ( --< Sample source table
    Select * From (Values
        ('R1', 100),
        ('R2', 100),
        ('R3',  70),
        ('R4',  50),
        ('R5', 200)
    ) V (ReceiptNo, Amount)
), ReceiptWithTotal As ( --< Source table with Running Totals calculated
    Select *,
        SUM(Amount) Over (Order By ReceiptNo Rows Unbounded Preceding) - Amount As RunningTotalBefore,
        SUM(Amount) Over (Order By ReceiptNo Rows Unbounded Preceding) As RunningTotalAfter
    From Receipt
), Due As ( --< Helper table to define intervals (can be generated dynamically to cover any Total)
    Select * From (Values
        ('D1',   0, 100),
        ('D2', 100, 200),
        ('D3', 200, 300),
        ('D4', 300, 400),
        ('D5', 400, 500),
        ('D6', 500, 600)
    ) V (DueNo, AmountLow, AmountHigh)
)
Select DueNo, ReceiptNo,
    IIF(AmountHigh < RunningTotalAfter, AmountHigh, RunningTotalAfter) -
    IIF(AmountLow > RunningTotalBefore, AmountLow, RunningTotalBefore) As Amount
From Due
Inner Join ReceiptWithTotal On NOT (RunningTotalAfter <= AmountLow OR RunningTotalBefore >= AmountHigh)

Vänligen notera:SUM(...) Over (Order By ... Rows Unbounded Preceding) och IIF(...) är endast tillgängliga på SQL Server 2012+. Detsamma kan göras på SQL Server 2008 genom sub-query men mycket mindre effektivt:

With Receipt As ( --< Sample source table
    Select * From (Values
        ('R1', 100),
        ('R2', 100),
        ('R3',  70),
        ('R4',  50),
        ('R5', 200)
    ) V (ReceiptNo, Amount)
), ReceiptWithTotal As ( --< Source table with Running Totals calculated
    Select *, RunningTotalAfter - Amount As RunningTotalBefore
    From (
        Select *,
            (Select SUM(Amount) From Receipt B Where B.ReceiptNo <= A.ReceiptNo) As RunningTotalAfter
        From Receipt A
    ) A
), Due As ( --< Helper table to define intervals (can be generated dynamically to cover any Total)
    Select * From (Values
        ('D1',   0, 100),
        ('D2', 100, 200),
        ('D3', 200, 300),
        ('D4', 300, 400),
        ('D5', 400, 500),
        ('D6', 500, 600)
    ) V (DueNo, AmountLow, AmountHigh)
)
Select DueNo, ReceiptNo,
    CASE WHEN AmountHigh < RunningTotalAfter THEN AmountHigh ELSE RunningTotalAfter END -
    CASE WHEN AmountLow > RunningTotalBefore THEN AmountLow ELSE RunningTotalBefore END As Amount
From Due
Inner Join ReceiptWithTotal On NOT (RunningTotalAfter <= AmountLow OR RunningTotalBefore >= AmountHigh)