根据select语句更新列信息

Question

我在 sql server 2008 中使用此查询从大量行中选择行数

(select *
from (select *,
             row_number() over (partition by 
                     [Patient Family registration no# رقم الملف] order by ((CONVERT(date,[date of visit] ) ))) as seqnum
      from MFC  
      ) t
where  seqnum = 1)

现在我需要将我选择的这些行的列调用（访问类型）更新为“新访问”，我该怎么做？ 谢谢

Answer 1

您可以使用可更新的 CTE：

with toupdate as (
      select mfc.*,
             row_number() over (partition by [Patient Family registration no# رقم الملف]
                                order by CONVERT(date, [date of visit] )
                               ) as seqnum
      from MFC  
     )
update toupdate
    set TypeOfVisit = 'New Visit'
    where seqnum = 1;