Question

我在SQL Server中遇到递归查询问题。

假设我有2个表：

Holiday：此表存储所有假期（holidayDate非工作日）
Invoice：此表存储下一个付款日期（nextPaymentDate）

如果nextPaymentDate位于假期表中的holidayDate，那么我需要更新它：

nextPaymentDate = nextPaymentDate + 1 day

此步骤需要处理，直到nextPaymentDate不再holidayDate为止。

请参阅下面的示例数据示例：

Holiday表：

HolidyaID      HolidayDate
-----------------------------
   1           2012-01-02
   2           2012-01-03
   3           2012-01-04
   4           2012-01-08
   5           2012-01-12
   6           2012-01-13
   7           2012-01-20
   8           2012-01-21
   9           2012-01-22
   10          2012-01-23
   11          2012-01-29
   12          2012-01-30

Invoice表

InvoiceID      NextPaymentDate
------------------------------
   1           2012-01-01
   2           2012-01-02
   3           2012-01-09
   4           2012-01-20

运行此查询后，我希望在Invoice表格中看到这样的数据

InvoiceID      NextPaymentDate
-------------------------------
   1               2012-01-01
   2               2012-01-05
   3               2012-01-09
   4               2012-01-24

如何创建SQL查询以输出此结果？

您可以在http://sqlfiddle.com/#!6/de346/3

谢谢！

Answer 1

select InvoiceID,
Case when [holidaydate] is null then [NextPaymnetDate]
else
DateAdd(dd,1,
(Select min([holidaydate]) from holiday h
where  h.[holidaydate]>[NextPaymnetDate]
and not exists(Select * from holiday h2 where h2.[holidaydate]=DateAdd(dd,1,h.[holidaydate])) 
))
end
from invoice
left Join holiday on [holidaydate]=[NextPaymnetDate]

Answer 2

with holidayBatch as
(
  select workingdate = dateadd(dd, 1, holidayDate)
  from Holiday h
  where not exists (select 1 from Holiday nxt
                    where nxt.holidaydate = dateadd(dd, 1, h.holidaydate))
)
select i.invoiceid,
  case when h.holidaydate is null then i.NextPaymentDate else hb.workingdate end
from Invoice i
  left join Holiday h on i.NextPaymentDate = h.holidaydate
  outer apply (select top 1 workingdate
              from holidayBatch hb where workingdate > NextPaymentDate
              order by workingdate) hb
order by i.invoiceid

SQL Fiddle

Answer 3

    select invoiceid, coalesce(nd,NextPaymnetDate) dd from invoice i left join
    (
    select *,(select min(dateADD(dd,1,holidaydate)) from holiday 
where holidaydate>=h.holidaydate and 
dateADD(dd,1,holidaydate) not in (select holidaydate from holiday)) nd 
    from holiday h) h on NextPaymnetDate = holidaydate;

SQL Server中的递归查询问题

3 个答案: