Asp.net 如何在SQL Server数据库中选择最后8行并求和其他列

我是新手。请帮我解决这个问题。 我想从数据库中选择最后8行和其他列。 我有列week、date和value1。 我想每周汇总一组值，只显示最后8条记录。我可以显示最近8周的数据，但无法对值1求和。 以下是显示本周的代码：

SELECT week FROM 
(SELECT Top 7 week 
 FROM tbData 
 Group By week 
 ORDER BY week DESC) as LW 
ORDER BY week ASC

它给我最后8周的时间，然后我将其更改为显示总和（值1）：

但它给我的错误是无效的列名“Value1”

我该怎么做才能把它做好。。。

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感谢您的帮助……

您的子查询中没有

Value1

列。我想你想做这样的事情：

SELECT SUM(Value1) as TValue1, week 
FROM 
(SELECT Top 7 week, sum(Value1) as Value1
 FROM tbData 
 Group By week 
 ORDER BY week DESC) as LW 
ORDER BY week ASC

试试这个

 SELECT SUM(Value1) as TValue1, week 
    FROM 
    (SELECT Top 7 week , sum(Value1) Value1
     FROM tbData 
     Group By week 
     ORDER BY week DESC) as LW 
    ORDER BY week ASC

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然后把这个放在末尾：>“如果

TOP x

，则

SQL Server

。亲爱的Dean，，，我尝试了您的代码，但它给我的错误是无效的列名值1…”。。。但是在我的表中有一个列名Value1。。。感谢您帮助我解决我的问题…亲爱的Der U，，，我尝试了您的代码，但它给我的错误是无效的列名值1。。。但是在我的表中有一个列名Value1。。。谢谢你帮我解决我的问题。。。

 SELECT SUM(Value1) as TValue1, week 
    FROM 
    (SELECT Top 7 week , sum(Value1) Value1
     FROM tbData 
     Group By week 
     ORDER BY week DESC) as LW 
    ORDER BY week ASC

SELECT Top 7 
 week
 ,sum(Value1) Value1
FROM 
 tbData 
GROUP BY 
 week 
ORDER BY 
 week DESC