如何显示多条记录的最新更新记录

Question

我已经加入两张表来提取我需要的数据。我无法只从一张表中显示最新的记录。我想要做的是寻找最后更新的值。我试图纳入max（）和row_num，但没有取得任何成功。

这是我目前有：

select distinct t1.CaId,t1.Enrolled,t1.Plan,t2.Category,t2.updateddate 
from table.one(nolock) t1 
inner join table.two(nolock) t2 on t1.CaId=t2.CaID 
where t1.coverageyear=2016 
and right(t1.Plan,2)<>left(t2.Category,2) 
order by 5 desc 

Answer 1

如果您想获得最后更新值，然后只是简单地添加到您的查询：

order by t2.updateddate desc 

它会显示最当前记录从表中。

Answer 2

你可以用，只是抓住每个ID的最后更新日期，像这样的子查询加入您的主查询：

select all_rec.CaId, all_rec.Enrolled, all_rec.[Plan], all_rec.Category, all_rec.updateddate 
from 
    (select distinct t1.CaId,t1.Enrolled,t1.[Plan],t2.Category,t2.updateddate 
    from [table.one](nolock) t1 
    inner join [table.two](nolock) t2 on t1.CaId=t2.CaID 
    where t1.coverageyear=2016 
    and right(t1.[Plan],2)<>left(t2.Category,2) 
    ) as all_rec 
inner join 
    (SELECT max(updateddate) AS LAST_DATE, CaId 
     FROM [table.two](nolock) 
     GROUP BY CaId) 
     AS GRAB_DATE 
on (all_rec.Ca_Id = GRAB_DATE.Ca_Id) 
and (all_rec.updateddate = GRAB_DATE.updateddate) 
order by 5 desc 

我加在你的table和Plan因为这些用法括号是SQL保留字。