SQL 服务器在同一查询中进行多个计数日期子选择

Question

我正在尝试找出一种方法来提取每个 customer id 的 订单计数 以及日期内第一个和最后一个订单的 date范围从 Orders table，其中每个订单都有 buyer_id 和 seller_id。订单 table 包含 OrderNumber、Buyer_ID、Seller_ID、OpenDate、ClosedDate。我可以单独运行以下查询来实现我的目标，但如果可能的话，我希望将所有内容都放在同一个查询中。

Order_Table:

OrderNumber, Buyer_ID, Seller_ID, OpenDate, ClosedDate

Buyer_ID 订单：

select Buyer_ID, COUNT(*)as BuyerOrders
from
(
    select Buyer_ID
    from Orders
    where OpenDate between @StartDate and @EndDate
)
a
group by Buyer_ID

Seller_ID 订单：

select Seller_ID, COUNT(*)as SellerOrders
from
(
    select Seller_ID
    from Orders
    where OpenDate between @StartDate and @EndDate
)
a
group by Seller_ID

该范围内的第一个和最后一个订单日期：??

非常感谢任何意见！

由于结果是并集，而同一个customer_id可能有一个条目是买家和卖家，我怎样才能将信息放在同一行？我的第一次尝试是根据联合的结果创建一个临时的 table，但我在如何在同一行上为每个 Customer_ID结果 table.

Answer 1

select 'Buyer' as Type, 
    Buyer_ID ID, 
    Count(*) OrderCount, 
    Min(OpenDate) FirstOrder, 
    Max(OpenDate) LastOrder
from Orders
where OpenDate between @StartDate and @EndDate
group by Buyer_ID

union

select 'Seller', 
    Seller_ID, 
    Count(*), 
    Min(OpenDate) FirstOrder, 
    Max(OpenDate) LastOrder
from Orders
where OpenDate between @StartDate and @EndDate
group by Seller_ID

[编辑] 是的，有点厚颜无耻地接受了我的回答，然后 un-accepting 它并改变了问题！无论如何，请尝试以下操作：

;with BuyerFirst (Buyer_ID, RowNum, BuyerCount, OrderID, OpenDate)
As
(select Buyer_ID, 
    ROW_NUMBER() over (partition by Buyer_ID order by OpenDate, OrderID) as RowNum,
    count(*) over (partition by Buyer_ID) As BuyerCount, 
    OrderID, 
    OpenDate
from Orders
where OpenDate between @StartDate and @EndDate),

BuyerLast (Buyer_ID, RowNum, OrderID, OpenDate)
As
(select Buyer_ID, 
    ROW_NUMBER() over (partition by Buyer_ID order by OpenDate Desc, OrderID Desc) as RowNum,
    OrderID, 
    OpenDate
from Orders
where OpenDate between @StartDate and @EndDate),

SellerFirst (Seller_ID, RowNum, SellerCount, OrderID, OpenDate)
As
(select Seller_ID, 
    ROW_NUMBER() over (partition by Seller_ID order by OpenDate, OrderID) as RowNum,
    count(*) over (partition by Buyer_ID) As SellerCount, 
    OrderID, 
    OpenDate
from Orders
where OpenDate between @StartDate and @EndDate),

SellerLast (Seller_ID, RowNum, OrderID, OpenDate)
As
(select Seller_ID, 
    ROW_NUMBER() over (partition by Seller_ID order by OpenDate Desc, OrderID Desc) as RowNum,
    OrderID, 
    OpenDate
from Orders
where OpenDate between @StartDate and @EndDate)


select c.*, 
    bf.BuyerCount, 
    bf.OpenDate As BuyerFirstOrderDate,
    bf.OrderID As BuyerFirstOrderID, 
    bl.OpenDate As BuyerLastOrderDate, 
    bl.OrderID As BuyerLastOrderID,
    sf.SellerCount, 
    sf.OpenDate As SellerFirstOrderDate,
    sf.OrderID As SellerFirstOrderID, 
    sl.OpenDate As SellerLastOrderDate, 
    sl.OrderID As SellerLastOrderID
from Customers c
    left join BuyerFirst bf on c.CustomerID = bf.Buyer_ID and bf.RowNum = 1
    left join SellerFirst sf on c.CustomerID = sf.Seller_ID and sf.RowNum = 1
    left join BuyerLast bl on c.CustomerID = bl.Buyer_ID and bl.RowNum = 1
    left join SellerLast sl on c.CustomerID = sl.Seller_ID and sl.RowNum = 1

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