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为简单起见，我将制作一个与我所拥有的类似的示例：

假设一个数据库有一个订单表，其中包含一个 OrderDate 字段和一个 Company 字段。然后是一张公司表，每条记录都有一个 YearEndingDate（表示年份在每年的那个日期结束，例如 6/6）。

我需要将每年的所有订单加起来。

我认为它必须是这样的，但我无法弄清楚：

SELECT SUM(orderValue),
CASE WHEN orderDate <= YearEndingDate THEN DatePart(year, orderDate)
CASE WHEN orderDate > YearEndingDate THEN DatePart(year, orderDate) + 1
END as Year
FROM Orders
INNER JOIN Company ON Company.companyID = Order.companyID
GROUP By Company, Year

有任何想法吗？

4

1 回答 1

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不确定您使用的是什么 RDMS，但这应该可以解决问题。datepart 和 dateadd 的东西是 tsql 特定的，但我假设您可以在您使用的任何平台上访问类似的功能。where 中的大小写决定了使用哪个年份值。

回答：

select c.companyid
      ,yearendingdate + '/' + convert(varchar, datepart(yy, dateadd(yy,1,o.orderdate))) as yearending
      ,sum(ordervalue) as numberoforders
  from @orders o
       join @companies c
         on o.companyid = c.companyid
 where orderdate between case when (cast(yearendingdate + '/' + convert(varchar, datepart(yy, o.orderdate)) as datetime) >= o.orderdate)
                         then yearendingdate + '/' + convert(varchar, datepart(yy, dateadd(yy,-1,o.orderdate)))
                         else yearendingdate + '/' + convert(varchar, datepart(yy, o.orderdate))
                          end
                     and 
                         case when (cast(yearendingdate + '/' + convert(varchar, datepart(yy, o.orderdate)) as datetime) >= o.orderdate)
                         then yearendingdate + '/' + convert(varchar, datepart(yy, o.orderdate))
                         else yearendingdate + '/' + convert(varchar, datepart(yy, dateadd(yy,1,o.orderdate)))
                          end
 group by c.companyid, o.orderdate, yearendingdate

找出问题的代码：

declare @orders table (OrderDate datetime
                      ,CompanyID varchar(20)
                      ,OrderValue int)

insert into @orders
values (getdate(),'MS',2)

insert into @orders
values (DateAdd(year, -1, getdate()),'MS',3)

insert into @orders
values (DateAdd(year, -1, getdate()),'MS',1)

insert into @orders
values (DateAdd(year, 1, getdate()),'MS',4)

insert into @orders
values (DateAdd(year, 1, getdate()),'Blizzard',2)

insert into @orders
values (getdate(),'MS',11)

declare @companies table (CompanyID varchar(20)
                         ,YearEndingDate varchar(20))

insert into @companies
values ('MS', '05/6')

insert into @companies
values ('Blizzard', '07/01')

select c.companyid
      ,o.orderdate
      ,yearendingdate + '/' + convert(varchar, datepart(yy, o.orderdate)) as sameyear
      ,yearendingdate + '/' + convert(varchar, datepart(yy, dateadd(yy,1,o.orderdate))) as plusyear
      ,yearendingdate + '/' + convert(varchar, datepart(yy, dateadd(yy,-1,o.orderdate))) as minusyear
  from @orders o
       join @companies c
         on o.companyid = c.companyid

select c.companyid
      ,yearendingdate + '/' + convert(varchar, datepart(yy, dateadd(yy,1,o.orderdate))) as yearending
      ,sum(ordervalue) as numberoforders
  from @orders o
       join @companies c
         on o.companyid = c.companyid
 where orderdate between case when (cast(yearendingdate + '/' + convert(varchar, datepart(yy, o.orderdate)) as datetime) >= o.orderdate)
                         then yearendingdate + '/' + convert(varchar, datepart(yy, dateadd(yy,-1,o.orderdate)))
                         else yearendingdate + '/' + convert(varchar, datepart(yy, o.orderdate))
                          end
                     and 
                         case when (cast(yearendingdate + '/' + convert(varchar, datepart(yy, o.orderdate)) as datetime) >= o.orderdate)
                         then yearendingdate + '/' + convert(varchar, datepart(yy, o.orderdate))
                         else yearendingdate + '/' + convert(varchar, datepart(yy, dateadd(yy,1,o.orderdate)))
                          end
 group by c.companyid, o.orderdate, yearendingdate
于 2009-06-26T22:46:31.363 回答