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  3. September 2020

Re: SQL Max question

You seem to be missing stuff in the first example - the where RowNbr = 1


With x as (Select a.*, Row_Number() Over(Partition by SDDID# Order

By SNStatus2 Desc) RowNbr

from WHSDTA.WHSSDOPT a

where sdentrydt >= '2020-01-01' and sdentrydt <= '2020-12-31' and

sdstatus <> 'V' and sdmanbl# = 0 and sdmanif# = 0)


Select *

from x

where RowNbr = 1;


On the second one - you created a CTE, then don't use it? Maybe this

With x as (Select SDDID#, Max(SNStatus2) MaxStatus

from WHSDTA.WHSSDOPT

Group by SDDID#)

select a.*

from WHSDTA.WHSSDOPT a join x on a.SDDID# = x.MaxStatus

where sdentrydt >= '2020-01-01' and sdentrydt <= '2020-12-31' and

sdstatus <> 'V' and sdmanbl# = 0 and sdmanif# = 0;

On Tue, 2020-09-08 at 10:40 -0400, Art Tostaine, Jr. wrote:

I tried both of Birgitta's these examples and they both returned multiple

records for each SDDID#. Here is the complete SQL's I tried:


With x as (Select a.*, Row_Number() Over(Partition by SDDID# Order

By SNStatus2 Desc) RowNbr

from WHSDTA.WHSSDOPT a

where sdentrydt >= '2020-01-01' and sdentrydt <= '2020-12-31' and

sdstatus <> 'V' and sdmanbl# = 0 and sdmanif# = 0)


Select *

from x


And:


With x as (Select SDDID#, Max(SNStatus2) MaxStatus

from WHSDTA.WHSSDOPT

Group by SDDID#)

select a.*

from WHSDTA.WHSSDOPT a join WHSDTA.WHSSN00 x on a.SDDID# = x.SNDID#

where sdentrydt >= '2020-01-01' and sdentrydt <= '2020-12-31' and

sdstatus <> 'V' and sdmanbl# = 0 and sdmanif# = 0;



On Sun, Sep 6, 2020 at 8:41 AM Birgitta Hauser <

<mailto:Hauser@xxxxxxxxxxxxxxx>

Hauser@xxxxxxxxxxxxxxx



wrote:


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

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-----Original Message-----

From: MIDRANGE-L <

<mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx>

midrange-l-bounces@xxxxxxxxxxxxxxxxxx

On Behalf Of

Vernon Hamberg

Sent: Sonntag, 6. September 2020 06:54

To: Midrange Systems Technical Discussion <

<mailto:midrange-l@xxxxxxxxxxxxxxxxxx>

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 <

<mailto:alan0307d@xxxxxxxxx>

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.

<

<mailto:atostaine@xxxxxxxxx>

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

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--

Art Tostaine



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