Question

Okay so I have the sql to work this out as asked in the stackoverflow question here.

Does anyone know how to translate this to linq 2 sql? I’m guessing that the easiest way is to add a stored procedure, but I am curious to see if it can be linq-a-fied 😛

select p.* 
from post p join
(
    select memberId, max(createdDate) as maxd 
    from post 
    group by memberId

) as p2 on p.memberid = p2.memberid and p.createdDate=p2.maxd
order by p.createdDate desc

Answer 1

I’m not totally sure this is the most efficient way to run this query (maybe it is, but I’ve got a feeling there’s a better way. Haven’t thought of it yet).

from
    post in Nt_Post
join
    memberdates in (
        from
                p_inner in Nt_Post
        group
                p_inner by p_inner.MemberId into grouped 
        select new {
                MemberId = grouped.Key,
                ActivationDate = grouped.Max(m => m.ActivationDate)
        })
on
    new { post.MemberId, post.ActivationDate }
    equals
    new { memberdates.MemberId, memberdates.ActivationDate }
orderby post.ActivationDate
select post;