Picking latest entry to join to

Hi All,

Quite a simple one hopefully.

I am joining to a table that has a number of entries for each ID. All info is the same for each ID, except [date] and [val]. In my join condition, I want to return all data relating to the most recent entry.

What's the best way of doing this?

Thanks
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James ElliottManaging DirectorAsked:
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
<total air code for a two-line question.  let me know if this works.>
SELECT st.id, st.goo, st.foo, st.boo, mt.max_date
FROM some_table st
   JOIN (SELECT id, max(date) as max_date from max_table GROUP BY id) mt ON st.id = mt.id

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Also, I have an article out there called SQL Server GROUP BY Solutions that has lots of examples of how to join with/to aggregated data.
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Johny BravoCommented:
Not sure what exactly you are trying to achieve, but
you can use CROSS APPLY for joining latest record. If you can share your db structure with sample data, it might be useful. Although you can check CROSS APPLY
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James ElliottManaging DirectorAuthor Commented:
Thanks both.
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Thanks for the split.  For future reference though, more details provided in the original question, to include a data mockup of before / after = more precise answers we can give.
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Microsoft SQL Server 2008

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