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SQL:如何按自定义年度分组

group-by datetime sql

Jared · 技术社区 · 15 年前

为了简单起见,我将用一个类似的例子来说明我所拥有的:

假设一个数据库有一个订单表,其中有一个orderdate字段和一个company字段。然后有一个公司表,每个记录都有一个年终日期(这意味着每年的年终日期都是这样的,例如6/6)。

我需要把每年的订单加起来。

我想应该是这样的,但我不太明白:

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

有什么想法吗?

1 回复 | 直到 15 年前

ahsteele tungi52 15 年前

不确定您使用的是什么RDM,但这应该可以做到这一点。datepart和dateadd是特定于tsql的,但我假设您可以在使用的任何平台上访问类似的函数。Where中的情况决定使用哪一年的值。

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

解决问题的代码:

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