Question

请注意我有两张桌子：

我希望表薪水中的trnamt更新到rec记录中的tbl_emi，但金额不应超过每条记录的emi金额，例如在这种情况下，应添加工资表中的金额1000 500到第一个记录，另一个500到第二个记录到tbl_emi表

               tbl_emi
EMI      DUEDT      REC     Acno
500    4/30/2014   500       123
500    5/30/2014   0         123 
500    6/30/2014   0         123 

              slary
         Acno      Trnamt
         123         1000

我使用了以下查询，但它仍然在tbl_emi tbale中的rec字段+工资表中的trnamt添加，但不应超过emi数量。

select query1：为累积的emi

创建临时表

select a.emi, a.duedt, a.rec, a.acno, coalesce(sum(b.emi),0) as emi_accumulated
into #accumulated_amount5
from tbl_emi a
left join tbl_emi b on a.acno = b.acno and b.duedt < a.duedt
group by a.emi, a.duedt, a.rec, a.acno;

Query2：为工资金额

创建临时表

select a.*, s.RECAMT as salary_amt
into #accumulated_amount_with_salary5
from #accumulated_amount5 a
inner join Tbl_Fin s on a.acno = s.CARDNO;

更新查询1：更新重新计算金额

update #accumulated_amount_with_salary5
set rec = rec + case
    when salary_amt < emi_accumulated then 0
    when (salary_amt - emi_accumulated) < emi then salary_amt - emi_accumulated
    else emi
end

更新Query2

update t
set lastrecdate=(CAST(GETDATE() AS DATE)), rec = a.rec
from tbl_emi t
    inner join #accumulated_amount_with_salary5 a on t.acno = a.acno and t.duedt = a.duedt
    --Finance

Answer 1

假设您有累积和函数，通过计算累计emi值并与trnamt进行比较，这相对容易：

with toupdate as (
      select e.*, sum(emi) over (partition by acno order by duedt) as cumemi
      from tbl_emi e
     )
update toupdate
    set rec = (case when trnamt > cumemi then emi
                    else trnamt - cumemi + emi
               end)
    from toupdate join
         slary
         on toupdate.acno = slary.acno and
            toupdate.cumemi - emi < trnamt;

即使没有累积总和，您仍然可以使用相关子查询执行相同的操作。

编辑：

在SQL Server 2008中，您可以将累积总和表示为：

with toupdate as (
      select e.*,
             (select sum(e2.emi)
              from tbl_emi e2
              where e2.acno = e.acno and
                    e2.duedt <= e.duedt
             )  as cumemi
      from tbl_emi e
     )
update toupdate
    set rec = (case when trnamt > cumemi then emi
                    else trnamt - cumemi + emi
               end)
    from toupdate join
         slary
         on toupdate.acno = slary.acno and
            toupdate.cumemi - emi < trnamt;

Answer 2

你可以在工资表上插入触发器后使用，它会在工资表中的每次插入后更新tbl_emi表，有关如何在sql-server中创建触发器的参考，请参阅http://www.codeproject.com/Articles/25600/Triggers-SQL-Server

添加perovious字段数量

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