Question

我们说我的查询结果如下：

ContactID     LeadSalePrice
---------------------------
   45           19.90
   45           18.00
   32           17.50

但是，我希望消除重复的ContactID，始终采用更高的价格结果。所以我想要的是：

ContactID     LeadSalePrice
---------------------------
   45           19.90
   32           17.50

这是查询的简化版本：

SELECT 
    sc.ContactID
    , c.LeadSalePrice
FROM
    LeadSalesCampaignCriterias c
    JOIN LeadSalesCampaigns sc ON c.LeadSalesCampaignID = sc.LeadSalesCampaignID
WHERE
    ...
ORDER BY 
    LeadSalePrice DESC

我一直在玩DISTINCT和GROUP BY，但我没有得到它。

Answer 1

只需使用GROUP BY：

SELECT sc.ContactID, MAX(c.LeadSalePrice) as LeadSalePrice
FROM LeadSalesCampaignCriterias c JOIN
     LeadSalesCampaigns sc
     ON c.LeadSalesCampaignID = sc.LeadSalesCampaignID
WHERE ...
GROUP BY sc.ContactID;

Answer 2

另一个选项是WITH TIES和Row_Number（）

Select Top 1 with Ties *
 From YourTable 
 Order By Row_Number() over (Partition By ContactID Order By LeadSalePrice Desc)

返回

ContactID   LeadSalePrice
32          17.50
45          19.90

消除单个列的重复结果

2 个答案: