Question

select unique values (selecting the most recent record based on date)

Asked by: red27man

hi

i need to select unique values based on date(the recent date)

the table is like this

name     created
aa           5/5/03
bb           6/3/04
cc           3/3/04
aa           8/8/04
bb           3/3/03

the output i am looking for is
name      created
aa           8/8/04
bb           6/3/04
cc           3/3/04

thanks
red

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Asked On
2004-08-20 at 12:16:52ID21101580
Tags

select

,

recent

,

date

,

most

,

record

Topic

Databases Miscellaneous

Participating Experts
3
Points
250
Comments
8

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Answers

 

by: DexstarPosted on 2004-08-20 at 12:23:57ID: 11854996

red27man:

> i need to select unique values based on date(the recent date)

Try this:
    SELECT Name, MAX(Created) FROM YourTable GROUP BY Name

Hope That Helps,
Dex*

 

by: jltoopsPosted on 2004-08-20 at 12:46:28ID: 11855202

This is works if you have MORE than just NAME in your source table

select *
from MyTable m
inner join ( select name, max([created]) as maxdate
                 from MyTable
                 group by name ) as x
                 on m.name= x.name
                 and m.[created] = x.maxdate )

Jay

 

by: jltoopsPosted on 2004-08-20 at 12:50:33ID: 11855244

oops ... PLEASE delete the LAST )
the function should read

select *
from MyTable m
inner join ( select name, max([created]) as maxdate
                 from MyTable
                 group by name ) as x
                 on m.name= x.name
                 and m.[created] = x.maxdate

Jay

 

by: red27manPosted on 2004-08-20 at 13:05:36ID: 11855387

It still gives the duplicate values



the output i am looking for is
name      created
aa           8/8/04
bb           6/3/04
cc           3/3/04


one record each of the "name" field ( that  one record being the most recent)

let me put it the other way
i need to have  distinct value of  " name" field ( where the distinct value being selected is based on created)

thanks
shri


thanks
red

 

by: DexstarPosted on 2004-08-20 at 14:18:29ID: 11856134

red27man:

> let me put it the other way
> i need to have  distinct value of  " name" field ( where the distinct value being
> selected is based on created)

Did you get duplicates with my suggestion too?  The "Group By" part of it means to put all the Names in a group, so you shouldn't get any duplicates.

-D*

 

by: pek99Posted on 2004-08-20 at 15:53:15ID: 11856755

If you have duplicates with GROUP BY NAME, then you have probably "hidden" spaces in the column NAME.

Then this may work for you:

SELECT TRIM( Name), MAX(Created) FROM YourTable GROUP BY TRIM(Name);

 

by: jltoopsPosted on 2004-08-20 at 21:24:53ID: 11857678

add a sequential id field so that you can MAX that too.

jay then you WILL get only one record...
with mine if you have more than one identical date you can get duplicates.

Jay

 

by: red27manPosted on 2004-08-23 at 09:53:03ID: 11872473

Thanks...........i had to work a bit but both of them were helpful

red

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