AW: Record by record update with SQL with no matching key.

Dennis,

Common Table Expressions are only allowed for SELECT-Statements, but do not
work in composition with Update!

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)
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and keeping them!"

-----Ursprüngliche Nachricht-----
Von: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von Dennis Lovelady
Gesendet: Monday, 01. February 2010 17:46
An: 'Midrange Systems Technical Discussion'
Betreff: RE: Record by record update with SQL with no matching key.

So, how would I join the two records by rownumber? I think I have to
use a subquery since I'll need to alias the rownumber results but I
can't quite get my head around the syntax

The update would look like:
update realtable set firstname = firstfake, lastname = lastfake

the where would use the derived rownumber columns (say rn1,and rn2)

There are some rules about what can follow a WITH statement, and I don't
have the facility to test this concept, but here's my stab:

WITH T1 AS (
SELECT rownumber fakerow, firstname firstfake, lastname lastfake
FROM FAKETALE
)
, T2 as (
SELECT rownumber realrow, keyval realkey
From REALTABLE
)
UPDATE REALTABLE SET firsname = firstfake, lastname = lastfake
Where keyval = realkey and fakerow = realrow

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
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