Get only one record per users.

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Get only one record per users.

Author

Topic

ugh3012
Yak Posting Veteran

62 Posts

Posted - 2013-10-29 : 13:26:26

I need to create a query that will select only one record out of x number of record per user id.


Sample Data
User ID    | Date       |Status
001        |10/1/2013   |01
001        |10/2/2013   |A1
002        |1/1/2013    |BB
003        |5/8/2013    |EE
003        |4/2/2013    |BB

Expected Result
User ID    | Date       |Status
001        | 10/2/2013  |A1
002        | 1/1/2013   |BB
003        | 5/8/2013   |EE

TG
Master Smack Fu Yak Hacker

6065 Posts

Posted - 2013-10-29 : 13:42:30

Here's one way:


select [User ID]
       , [Date]
       , [Status]
from   (
       select [User ID]
              , [Date]
              , [Status]
              , rn = row_number() over (partition by [user id] order by [date] desc)
       from yourtable
       ) d
where  rn = 1

Be One with the Optimizer
TG

ushavellala
Starting Member

10 Posts

Posted - 2013-10-29 : 17:50:26

Select distinct UserID
from yourtable

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2013-10-30 : 05:33:31

quote:
Originally posted by ushavellala

Select distinct UserID
from yourtable

You need other columns as well. Try the code used by TG. Also read this for more such methods http://beyondrelational.com/modules/2/blogs/70/posts/10845/return-top-n-rows.aspx

Madhivanan

Failing to plan is Planning to fail

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