Question

这是一个非常简单的问题，我很确定。我有一个非常基本的查询

Select MAX(ExposureYear) AS YEAR,
        totalvalue

FROM [dbo].[DetailsView]

我希望它返回2012年的两条记录，但这是我得到的结果：

2009    647564
2009    818418
2009    818481
2012    8465153
2009    11739239
2012    22310900
2009    39305433

我做错了什么？

先谢谢

Answer 1

我认为你想要的更像是：

Select ExposureYear, totalvalue
FROM [dbo].[DetailsView]
where ExposureYear = (select MAX(ExposureYear) from DetailsView);

如果视图很昂贵，那么您可以改为使用窗口函数：

select ExposureYear, totalvalue
from (select v.*, max(ExposureYear) over () as maxey
      from [dbo].[DetailsView] v
     ) v
where ExposureYear = maxey;

Answer 2

MAX不能以这种方式工作，你想要这样的东西：

select * from [dbo].[DetailsView] where exposureyear = 
(select max(exposureyear) from [dbo].[DetailsView])

Answer 3

SELECT ExposureYear AS YEAR, totalvalue
FROM [dbo].[DetailsView]
WHERE ExposureYear = (SELECT MAX(ExposureYear) From FROM [dbo].[DetailsView])

Answer 4

您可以尝试这样：

select ExposureYear AS YEAR, totalvalue from [dbo].[DetailsView] where ExposureYear = 
(select max(ExposureYear) from [dbo].[DetailsView])

Answer 5

如果您的“ exposureYear ”列为varchar data type，则将其更改为int它将正常工作。

Answer 6

老兄保持简单，只需添加一个小组。

Select MAX(ExposureYear) AS YEAR, totalvalue
FROM [dbo].[DetailsView]
GROUP BY totalvalue

SQL Max不起作用？

6 个答案: