AW: Using SQL for File Record Comparison

Hi,

You may also use EXCEPT which returns all rows that are in table1 but not in
table2 without specifying any key, i.e. the complete row will be compared:

The following statment returns all rows that are in table1 but not in table2
and all rows that are in table2 but not in table1:

  (   Select * From Table1
   Except
      Select * From Table2)
Union
  (   Select * From Table2
   Except
      Select * From Table1)    

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!"

-----Ursprüngliche Nachricht-----
Von: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von Michael Ryan
Gesendet: Wednesday, March 07, 2007 19:03
An: Midrange Systems Technical Discussion
Betreff: Re: Using SQL for File Record Comparison


And that's true...but that one quick statement in Interactive SQL seems so
inviting. :)

On 3/7/07, DeLong, Eric <EDeLong@xxxxxxxxxxxxxxx> wrote:

I don't think this plays to SQL's strengths.  You'd be able to do this 
fairly easily with the RPG cycle, using primary/secondary files by 
matching keys.  RPG lets you compare the record format data, so only 
one test is needed to determine whether the primary and secondary 
records are alike.

The cycle is not really necessary, but it plays nicely with your 
requirements....

JMO,
Eric

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx 
[mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of Michael Ryan
Sent: Wednesday, March 07, 2007 11:28 AM
To: Midrange Systems Technical Discussion
Subject: Using SQL for File Record Comparison


Does this make sense? Is there a better way? I'm trying to find out if 
two files are the same. Here's my SQL statement:

SELECT count(*) FROM firstlib/mhrdclp a, secondlib/mhrdclp b where 
a.mdvnda = b.mdvnda and a.mdmdl = b.mdmdl and (a.mddual <> b.mddual or 
a.MDCMFRT <> b.MDCMFRT or a.MDLP <> b.MDLP or a.MDSF <> b.MDSF)

File MHRDCLP has the following fields:
mdvnda
mdmdl
mddual
mdcmfrt
mdlp
mdsf

I want to see if I have any records that match mdvnda and mdmdl have 
any of the other four fields different.

Thanks!
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