Question

我有以下查询：

select distinct CustomerID, SortOrder, Seq
from #result
Order By CASE 
    WHEN Substring(SortOrder, 0, 1) = '~' THEN 9999999 
    else SortOrder 
    END

但是，我收到以下错误消息：如果指定了SELECT DISTINCT，则ORDER BY项必须出现在选择列表中。

我怎样才能以正确的方式创建此自定义订单？

Answer 1

改为使用group by：

select CustomerID, SortOrder, Seq
from #result
group by CustomerID, SortOrder, Seq
Order By (CASE WHEN Substring(SortOrder, 0, 1) = '~' THEN 9999999 
               else SortOrder 
          END);

Answer 2

如果您不介意获取额外的列，那么只需在结果集中包含您的case语句：

SELECT DISTINCT  
    CustomerID,  
    SortOrder,  
    CASE  
    WHEN Substring(SortOrder, 0, 1) = '~' THEN 9999999  
    ELSE SortOrder  
    END 
FROM 
    #result 
ORDER BY  
    CASE  
    WHEN Substring(SortOrder, 0, 1) = '~' THEN 9999999  
    ELSE SortOrder  
    END

如何在sql中设置自定义Order

2 个答案: