Grigore Dolghin wrote:
> It seems I am missing something obvious, however I can't figure out what.
> 
> I have two tables, 1-to-many related. Parent table contains car information, 
> child table contains the registration numbers, with their date, as they 
> change.
> 
> Parent table fields:
> 
> Id, Serial, Model
> 
> Child table fields:
> 
> Id, CarId, RegNumber, RegDate
> 
> 
> How the heck the SQL that returns a list of the cars with their most recent 
> registration number looks like? I just can't figure it.
> 

Something like :

select *
from Parent
left join Child
        on Parent.Id = Child.Id
where Child.RegDate >= (
                        select Oldest.RegDate
                        from Child Oldest
                        where Oldest.Id = Child.Id
                        )


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