RE: SQL Max question

You can do it with a nested sub-select, but I prefer a Common Table Expression

With x as (Select #DID. Max(Status) MaxStatus
from YourTable
Group by #DID)
select a.*
from YourTable a join x on a.#DID = x.#DID;

You can also can get the result by using the ROW_NUMBER() OLAP Specification:

With x as (Select a.*, Row_Number() Over(Partition by #DID Order By Status Desc) RowNbr
from OrderDetx a)
Select *
from x
Where RowNbr = 1;

Mit freundlichen Grüßen / Best regards

Birgitta Hauser


"Shoot for the moon, even if you miss, you'll land among the stars." (Les Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them and keeping them!"
„Train people well enough so they can leave, treat them well enough so they don't want to.“ (Richard Branson)


-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Vernon Hamberg
Sent: Sonntag, 6. September 2020 06:54
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: SQL Max question

Hello Art

If I may say back what I think you're saying -

You have a table with 1 row per DID# - that is, DID# is unique.

And status is not in this table.

And you want a result table that has all the columns from the first one, plus a status column that has the highest status for the DID# in that row.

OK, I think you are getting close and can get this with a JOIN and a nested table expression - you want the 2nd table to have the DID# and its highest status in it - then JOIN to that.

select table1.*, table2max.maxstatus from table1
join (select did#, max(status) maxstatus from table2 group by did#) table2max
on table1.did# = table2max.did#

Then you can do pretty much what you want - you could create a temp from this using CREATE TABLE, for example, and make it based on this SELECT statement.

HTH
Vern

On 9/5/2020 10:26 PM, Art Tostaine, Jr. wrote:

There is one row in my first table keyed by did. Other tables are
joined into this view but they are 1-1 by did. I joined it to a status
file that has Did and 1-20 statuses/rows.

In my new table I want all of the fields but only one row per did with
the highest status.

My goal is to create a temp table that I can run reports, extract to
csv, etc.

I wonder if I could create one row per did and then do an update with
a select from the status file getting only the max row from it.

On Sat, Sep 5, 2020 at 10:36 PM Alan Campin <alan0307d@xxxxxxxxx> wrote:

I am not completely understanding what you are doing here but
normalizing

table structure?



Could you respond with what you see the table structure would look like?



On Sat, Sep 5, 2020 at 6:52 PM Art Tostaine, Jr.
<atostaine@xxxxxxxxx>

wrote:

I have a table that has a DID#, many other columns, and a numeric
status field. I want the table to have all the columns and one row
per did#

with

the highest status value.
I'd like to either do a delete or create another temp table with
only

these

records. Is this possible?
I've looked at group by but that won't let me keep all columns in
the table.
I also checked out partition by but that's not what I want.
Thank you
--
Art Tostaine
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L)
mailing

list

To post a message email: MIDRANGE-L@xxxxxxxxxxxxxxxxxx To subscribe,
unsubscribe, or change list options,
visit: https://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxxxxxxxx
Before posting, please take a moment to review the archives at
https://archive.midrange.com/midrange-l.
Please contact support@xxxxxxxxxxxxxxxxxxxx for any subscription
related questions.
Help support midrange.com by shopping at amazon.com with our
affiliate
link: https://amazon.midrange.com

--

This is the Midrange Systems Technical Discussion (MIDRANGE-L)
mailing list

To post a message email: MIDRANGE-L@xxxxxxxxxxxxxxxxxx

To subscribe, unsubscribe, or change list options,

visit: https://lists.midrange.com/mailman/listinfo/midrange-l

or email: MIDRANGE-L-request@xxxxxxxxxxxxxxxxxx

Before posting, please take a moment to review the archives

at https://archive.midrange.com/midrange-l.



Please contact support@xxxxxxxxxxxxxxxxxxxx for any subscription
related questions.



Help support midrange.com by shopping at amazon.com with our
affiliate
link: https://amazon.midrange.com

--

Art Tostaine

--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit: https://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxxxxxxxx
Before posting, please take a moment to review the archives at https://archive.midrange.com/midrange-l.

Please contact support@xxxxxxxxxxxxxxxxxxxx for any subscription related questions.

Help support midrange.com by shopping at amazon.com with our affiliate link: https://amazon.midrange.com