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It does, that's an error in either case...

The only benefit to the RFE is when there's no rows in File B.

With the SQL Standard method, you'd need File A to support NULL for that
column.

Or as many do, change the update to use coalesce or to only update rows in
File A that have a match in File B.

Merge is easier now that we have that.

Charles

On Tue, Oct 27, 2020 at 10:29 AM Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>
wrote:

Doesn't the suggested syntax have the same problem? Multiple rows in
fileB where fileB.key = fileA.key?

Vern

On 10/27/2020 11:26 AM, Alan Shore via MIDRANGE-L wrote:
Hi Vern
What happens if in fileA, there is one record with key with a value of 1
(lets keep it simple)
But in fileB - there are more that one record with key with a value of 1
You may have been lucky in that the time it worked for you there was a 1
to 1 relationship from fileA to fileB

Alan Shore
E-mail : ASHORE@xxxxxxxx
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
'If you're going through hell, keep going.'
Winston Churchill


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx] On
Behalf Of Vernon Hamberg
Sent: Tuesday, October 27, 2020 12:21 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx

Subject: [EXTERNAL] Re: RFE for SQL update from

Can't we do something like this already?

update fileA

set fileA.field1 = (select field1

from fileB wherekey = fileA.key)

I could be wrong, but I feel like I've done this. Please correct me it
it's not doable.

And how is the RFE request different from that?

Cheers
Vern

On 10/27/2020 8:54 AM, Gad Miron wrote:
All folks


I've registered an RFE for SQL Update with a From clause.


http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=1
463


update fileA

set fileA.field1 = fileB.field1

from fileA inner join fileB on fileB.key = fileA.key



May I have your votes please.


Thanks

Gad
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