asp.net - how to select the last 8 row and Sum other column in Database SQL Server -


I'm a newbie help me with this problem. I want to select the last 8 lines and other columns from the database. I have column week, date and value 1. I want to add the value 1 group to the week and only want to display the last 8 records. I can display the last 8 weeks, but can not add value1 My code is here to display the week: 

  select the week (weeks by the LAW ordinate  / pre> 
 This gives me the last 8 weeks, then I change it to change the amount in it (value 1):  
  as SELECT SUM (Value1) TValue1, week FROM (SELECT Top 7 week   
 TBData By order by week, by DESC), but it gives me an error Invalid column name 'value1'.  
 What should I do to fix this ... Thanks in advance .. ..   
 
 
 there is no  value1  column in your subquery. I hope That you want to do something like this:  
  TVallue1, week FROM (SELECT Top 7 week, sum (Value1) as SELECT SUM (Value1)     Diissi week by order of 1 somewhere on the week TBData Group)

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