If you need the row_number() in a specific sequence you need to add a ORDER
BY clause to the OVER() clause.
Otherwise the sequence may or may not match the retuning result sequence.
(according to the documentation)
I asked the same question sometimes ago the guys in Rochester.
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@xxxxxxxxxxxx> On Behalf Of Patrick
Conner via MIDRANGE-L
Sent: Donnerstag, 29. November 2018 17:49
To: midrange-l@xxxxxxxxxxxx
Cc: Patrick Conner <pwconner@xxxxxxx>
Subject: row_number ignores where clause w/ order by
select row_number() over() as rowNumber, s.*
from qSys2.sysTableStat s
where regExp_like( table_schema, 'CLOCF' );
order by data_size desc;
When I run the statement above to the first semicolon (without 'order
by'), the row_number function works as expected. The first row is numbered
1, second is 2, etc. If I remove the semicolon and run the statement with
the 'order by' clause, the first row is 55, the second is 57, the third is
137, etc. I was curious and commented out the 'where' clause and ran the
statement. The 55th record without the 'where' clause was the first record
in my previous results. So, the row_number ignores the 'where' clause when
the 'order by' clause is used. Is this behavior normal or am I using the
functions wrong?
System is at 7.3 and I'm using ACS Run Scripts.
I listed the issue in IBM Developerworks, too. Try:
https://www.ibm.com/developerworks/community/forums/html/topic?id=fd1c41f9-c
f56-4f2e-a633-5337270f43e8&ps=
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