带有累积的SQL查询条件查询

Question

我有以下存储过程：

select
    employeename,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 1 THEN cs.amount ELSE 0 END), 0) as january,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 2 THEN cs.amount ELSE 0 END), 0) as february,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 3 THEN cs.amount ELSE 0 END), 0) as march,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 4 THEN cs.amount ELSE 0 END), 0) as april,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 5 THEN cs.amount ELSE 0 END), 0) as may,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 6 THEN cs.amount ELSE 0 END), 0) as june,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 7 THEN cs.amount ELSE 0 END), 0) as july,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 8 THEN cs.amount ELSE 0 END), 0) as august,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 9 THEN cs.amount ELSE 0 END), 0) as september,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 10 THEN cs.amount ELSE 0 END), 0) as october,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 11 THEN cs.amount ELSE 0 END), 0) as november,
    ISNULL(SUM(CASE WHEN datepart(mm,cs.scheduledate) = 12 THEN cs.amount ELSE 0 END), 0) as december,
    ISNULL(SUM(cs.amount),0) as a_cds
from 
    statements cs
join
    employee mc on mc.employeeid = cs.employeeid
where 
    cs.chargetype = @chargetype

    -- if @accumulate = 1 then SUM all statement amounts from old months
    and ((datepart(mm, cs.scheduledate) <= @month and @accumulate = 1)
          or (datepart(mm, cs.scheduledate) = @month and @accumulate = 0))

    -- if selection is Biweekly (Q) then filter by that
    and ((@chargetype = 'Q' and @biweeklypart = 1 and day(cs.scheduledate) = 15) or 
         (@chargetype = 'Q' and @biweeklypart = 2 and day(cs.scheduledate) <> 15) or
         (@chargetype <> 'Q')
        )
group by
    employeename

使用此SP但Accumulate过滤器，一切都很好用。当@chargetype 不是'问'时，仅适用。

让我们看看以下示例数据：

对于员工15：

• @accumulate = 1
• @month = 2
• @chargetype ='Q'
• @biweeklypart = 2

我应该获得所有先前声明记录的SUM，包括02/28/2018。如上所述，这在@chargetype ='M'时工作正常。

有任何线索吗？