Question

Selecting all records that have a max value in another column?

Asked by: cshlin

Hi there,
I have a table where I want to retrieve all the records that have a maximum modified date for a particular fact:

FACT_ID, FACT1, MODIFIED_DATE ... (100 other facts)
1, A, 2008-01-01 00:00:00.000
2, A, 2008-02-01 00:00:00.005
3, A, 2008-02-01 00:00:00.005
4, B, 2007-01-01 00:00:00.000
5, B, 2008-05-05 00:00:00.000

I would like the query to return rows 2, 3, and 5.. I've only been able to do this using a cursor so far iterating through all the fact_ids, but I'm sure there must be a set operation that can do this :)

Thanks,

Charles

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Asked On
2008-11-02 at 14:11:41ID23869382
Tags

SQL Server 2005

Topics

SQL Server 2005

,

SQL Query Syntax

Participating Experts
2
Points
125
Comments
4

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Answers

 

by: jamesguPosted on 2008-11-02 at 14:17:33ID: 22863606

select * from <your_table> a,
inner join (select FACT_ID, FACT1, max(MODIFIED_DATE) as max_MODIFIED_DATE from <your_table> group by FACT_ID, FACT1) b
where a.FACT_ID  = b. FACT_ID
and a. FACT1  = b. FACT1  
and a. MODIFIED_DATE = b. max_MODIFIED_DATE

 

by: jamesguPosted on 2008-11-02 at 14:31:40ID: 22863658

try this one instead of the previous

select * from <your_table> a,
inner join (select FACT1, max(MODIFIED_DATE) as max_MODIFIED_DATE from <your_table> group by FACT1) b
where a.FACT_ID  = b. FACT_ID
and a. MODIFIED_DATE = b. max_MODIFIED_DATE

 

by: BrandonGalderisiPosted on 2008-11-02 at 15:30:27ID: 22863851

Try this:

with RankedData as
(select *,dense_rank() over(partition by fact1 order by modified_date desc) dr from YourTable)
select * from RankedData
where dr=1

20120131-EE-VQP-002

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