Question

我是SQL的新手，我有一个表，用于存储客户要求的成对选项。此表如下所示：

**CustomerID, Product 1, Product2**
   15     ,    338     , 298
   15      ,   161     , 241

我想在检查库存数据时最终得到可用产品对的列表，例如：

**StockData**
298
338
161
91
241
96
99
102
104

股票数据如下所示：

static FTThreeStateCheckBox()
{
    IsCheckedProperty.OverrideMetadata(typeof(FTThreeStateCheckBox), new FrameworkPropertyMetadata(null, IsCheckedChanged));          
}


public static void IsCheckedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    if ((d as FTThreeStateCheckBox).IsChecked == null)
    {
        (d as FTThreeStateCheckBox).IsThreeState = false;
        (d as FTThreeStateCheckBox).IsChecked = false;
    }            
}

Answer 1

如果您想要的是每个客户有2个产品选项的每种组合，那么这样的自我加入应该有效：

select p1.customerID, p1.productID product1, product2.productID product2
from options p1 
join options p2 on p2.customerID=p1.customerID
and p1.productID<p2.productID
where p1.productID in (select productID from stock)
and p2.productID in (select productID from stock)

如果您想要第一批可用的产品，优先考虑选项编号，那么您可以这样做：

;with productpairs as
(
    select p1.customerID, p1.productID product1, product2.productID product2,
    p1.optionID+p2.optionID priority
    from options p1 
    join options p2 on p2.customerID=p1.customerID
    and p1.productID<p2.productID
),
orderedpairs as
(
    select *, ROW_NUMBER() OVER (PARTITION BY customerID ORDER BY priority) AS rn 
    from productpairs
)
select customerID, product1, product2
from oderedpairs 
where rn=1

SQL Server - 选择可用的股票期权对

1 个答案: