Question

我正在尝试从数据库中获得部门的唯一列表，以及部门的价格区ID号。

有人知道此代码为什么起作用（获取部门名称的唯一列表），但下面的后续代码却无效（唯一的区别是它添加了ps.PriceZoneID-PriceZoneID是PriceZone表中的一列）。

有效的代码：

Select  
    distinct (es.DepartmentName)
FROM AggregatedSalesHistory as ASH 
JOIN v_EnterpriseStructure as es on es.ProductSID = ash.ProductSID
JOIN PriceZone as ps on es.ProductSID = ash.ProductSID

无效的代码。

Select
    ps.PriceZoneID,
    distinct (es.DepartmentName)
FROM AggregatedSalesHistory as ASH 
JOIN v_EnterpriseStructure as es on es.ProductSID = ash.ProductSID
JOIN PriceZone as ps on es.ProductSID = ash.ProductSID

先谢谢了。

Answer 1

Distinct适用于所有列或表达式，但不起作用：

所以，应该是：

SELECT DISTINCT ps.PriceZoneID, es.DepartmentName
FROM AggregatedSalesHistory as ASH JOIN 
     v_EnterpriseStructure as es 
     ON es.ProductSID = ash.ProductSID JOIN 
     PriceZone as ps 
     ON es.ProductSID = ash.ProductSID;

或者您可能需要：

SELECT TOP (1) WITH TIES ps.PriceZoneID, es.DepartmentName
FROM AggregatedSalesHistory as ASH JOIN  
     v_EnterpriseStructure as es 
     ON es.ProductSID = ash.ProductSID JOIN 
     PriceZone as ps 
     ON es.ProductSID = ash.ProductSID
ORDER BY ROW_NUMBER() OVER (PARTITION BY es.DepartmentName ORDER BY ps.PriceZoneID);

添加PriceZoneID列时代码不起作用

1 个答案: