Why to use a nested sub-select at all?
wCount=0;
Exec SQL
Select 1 into :wCount
From File join File2 on date1 = date2
Where account = 123
Limit 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!"
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-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Darren
Strong
Sent: Donnerstag, 1. Juli 2021 19:04
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: SQL help
I would do it like this for performance. You don't want to count all the
records, just to see if one exists, and you don't really need to join the
two files. You just want to make sure there is a match in both. The "fetch
first row only" is important.
wCount=0;
exec sql select 1 into :wCount
from file
where account=123
and exists
(select * from file2 where date2=file1.date1)
Fetch first row only
-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
dfreinkel@xxxxxxxxxxxxxxxxx
Sent: Thursday, July 1, 2021 9:25 AM
To: 'RPG programming on IBM i' <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: SQL help
CAUTION: This email originated from outside of the organization. Do not
click links or open attachments unless you recognize the sender and know the
content is safe.
I have a SQLRPGLE program with the following example
Select CASE when count(*) is null then 0 else 1 end into :wCount
From file1 inner join file2 on date1=date2
Where account = 123
I get a decimal data error and it appears that the problem is with the
result, I assume. wCount is an integer. There are 2 records in the files
being read.
As it is in a RPG program, I cannot use IFNULL.
I can run the statement in interactive SQL without a problem.
Does anyone have a suggestion on how to resolve this?
Thank you.
Darryl Freinkel
A4G
Telephone: 770.321.8562 Mobile: 678.355.8562
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