如何获得由SQL

Question

最大的组值我有一个表，表中包含OperationDate，LotID，NewStatusID，opeTypeId

我想告诉OperationDate（TOP1）为每个批次。

我的查询是这样的：

 select a.OperationDate,a.LotID 
    FROM [dbo].[MMwLotOperations] a 
    where a.LotID in ('L705816008','L704511001') 
    GROUP by a.LotID,a.OperationDate 
having a.NewStatusID ='Assigned' AND a.opeTypeId = 'Status' 

该查询返回以下数据：

L705816008很多的NewStatusID返回1个数据

但L704511001很多的NewStatusID返回2个数据

现在我想显示每个地段最大的OperationDate。 这个怎么办？

请问您能帮我吗？

谢谢。

Answer 1

你可以使用MAX得到最大的日期和Group By

select MAX(a.OperationDate),a.LotID 
FROM [dbo].[MMwLotOperations] a 
where a.LotID in ('L705816008','L704511001') 
     AND a.NewStatusID ='Assigned' AND a.opeTypeId = 'Status' 
GROUP by a.LotID 

注意删除a.OperationDate：Having指定组或聚合的搜索条件。 在你的情况，把a.NewStatusID ='Assigned' AND a.opeTypeId = 'Status'到where条件

Answer 2

select * from 
( select a.OperationDate,a.LotID,ROW_NUMBER() OVER(partition by a.LotID ORDER BY a.OperationDate desc) as rn 
    FROM [dbo].[MMwLotOperations] a 
    where a.LotID in ('L705816008','L704511001') 
    GROUP by a.LotID,a.OperationDate 
having a.NewStatusID ='Assigned' AND a.opeTypeId = 'Status') where rn =1 

Answer 3

select MAX(a.OperationDate) as max_date,a.LotID 
    FROM [dbo].[MMwLotOperations] a 
    where a.LotID in ('L705816008','L704511001') 
    GROUP by a.LotID,a.OperationDate 
having a.NewStatusID ='Assigned' AND a.opeTypeId = 'Status' 

试试这个说法得到最大日

Answer 4

使用不同的关键字来选择a.LotID

select a.OperationDate,distinct(a.LotID) 
FROM [dbo].[MMwLotOperations] a 
where a.LotID in ('L705816008','L704511001') 
GROUP by a.LotID,a.OperationDate 
having a.NewStatusID ='Assigned' AND a.opeTypeId = 'Status' 

我希望这会为工作你