在SQL Server 2008中匹配两个表

Question

我有两张桌子：

1. Despatch
2. 激活

Despatch表包含供应商发送的产品数据，DispatchDate，LotQty e.t.c

激活表包含供应商在Despatch表中发送的安装在客户住所的产品数据，即ActivationDate，LotQty e.t.c

在以下查询的帮助下，我设法获得了一些问题的数据，

select
(
    select distinct QTY
    from Despatch
    where LOTQty = '1007'
)as LotQty

,(
    select COUNT(ProductNumber)
    from Despatch
    where LOTQty = '1007'
)as ApprovedQty

,(
    select distinct(DispatchDate)
    from Despatch
    where LOTQty = '1007'
)as DispatchDate

,(
    select distinct(ProductModel)
    from Despatch
    where LOTQty = '1007'
)as Model

,(
    select COUNT(ProductNumber)
    from Activation
    where LotQty = '1007'
)as Installed

产生如下结果：


但在上面的例子中，它需要整个已安装的数据。我的要求是针对该特定地段中的每个productNumber，它应首先检查发货日期。如果已安装表的激活日期仅大于DispatchDate表的Despatch，那么它应该考虑该条目，否则忽略它。

编辑：
我需要的是大致类似的东西

(   
 select COUNT(ProductNumber)
 from Activation
 where LotQty = '1007'and ActivationDate in Activation for that ProductNumber >   DispatchDate in Despatch for the same ProductName  
)as Installed

提前致谢。

Answer 1

您可以尝试过滤OUTER APPLY表达式中的激活行和按Dispatch表分组：

DECLARE @D TABLE
    (
      LotQty NVARCHAR(50) ,
      ProductNumber NVARCHAR(50) ,
      DispatchDate DATE ,
      ProductModel NVARCHAR(50)
    )
DECLARE @A TABLE
    (
      LotQty NVARCHAR(50) ,
      ProductNumber NVARCHAR(50) ,
      ActivationDate DATE
    )


INSERT  INTO @d
VALUES  ( '1007', 'N1', '20150112', 'ModelA' ),
        ( '1007', 'N2', '20150112', 'ModelA' ),
        ( '1007', 'N3', '20150112', 'ModelA' ),
        ( '1007', 'N4', '20150112', 'ModelA' ),
        ( '1007', 'N5', '20150112', 'ModelA' )

INSERT  INTO @A
VALUES  ( '1007', 'N1', '20150101' ),
        ( '1007', 'N1', '20150102' ),
        ( '1007', 'N2', '20150101' ),
        ( '1007', 'N2', '20150113' ),
        ( '1007', 'N2', '20150114' ),
        ( '1007', 'N3', '20150205' ),
        ( '1007', 'N4', '20150207' ),
        ( '1007', 'N5', '20150101' )

SELECT  d.LotQty ,
        COUNT(d.ProductNumber) AS ProductNumber ,
        MAX(DispatchDate) AS DispatchDate ,
        MAX(ProductModel) AS ProductModel ,
        SUM(o.c) AS Installed
FROM    @D d
        OUTER APPLY ( SELECT    COUNT(*) AS c
                      FROM      @A a
                      WHERE     d.LotQty = a.LotQty
                                AND d.ProductNumber = a.ProductNumber
                                AND a.ActivationDate > d.DispatchDate
                      GROUP BY  a.LotQty ,
                                a.ProductNumber
                    ) AS o
WHERE   d.LotQty = '1007'
GROUP BY d.LotQty

输出：

LotQty  ApprovedQty     DispatchDate    ProductModel    Installed
1007    5               2015-02-15      ModelA          4