RE: Easy way to determine if two tables contain the same data

I don't think it has anything to do with how much IBM "cares" about the product line. IBM cares greatly about Power Systems and IBM i. I think it is a matter of information availability and cost. Why would they go to that much expense when all of the announcement information is readily available online? I know I wouldn't take a day away from my work/family to go to a meeting when I could just go online and read the announcement. I also would rather IBM spend that money on continuing to add new features to IBM i.

Brian May
IBM i Modernization Specialist
Profound Logic Software
http://www.profoundlogic.com
937-439-7925 Phone
877-224-7768 Toll Free


              


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Don
Sent: Friday, March 29, 2013 9:20 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Easy way to determine if two tables contain the same data


Don't you just miss the days when IBM actually cared enough about the product line to have a real release announcement day in which they brought in all the local users for a half/full day of announcement information will ALL the new goodies that were being announced, features, SOFTWARE, LANGUAGE FEATURES, etc???

I guess there's just not enough folks left around to warrant those kinds of meetings anymore...

DR2

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Dave
Sent: Friday, March 29, 2013 5:10 AM
To: Midrange Systems Technical Discussion
Subject: Re: Easy way to determine if two tables contain the same data

For years I would have used UNION to see if the tables were the same, then investigate with EXCEPTION JOIN, often a lot more work. I'm astonished that this dates from V5R4. I wonder what other goodies are still waiting to be discovered.

2013/3/29 Peter Connell <Peter.Connell@xxxxxxxxxx>

Charles,
I did not know that.
Thanks.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:
midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Friday, 29 March 2013 12:29 p.m.
To: Midrange Systems Technical Discussion
Subject: Easy way to determine if two tables contain the same data

D
on't know if this technique has ever been posted here or not, but I
ran across the technique last night on a DB2 LUW forum and it works
just fine on DB2 for IBM i...

If you have a need to compare the contents of two tables to determine
if they match, here's the easy way.
select * from table1
EXCEPT
select * from table2

In my case, I was refactoring some code and wanted to make sure that
the output was still the same.

You can even use it on two different version of a table...you just
have to do a bit more typing. Example: Original table has fld1, fld2
and new table has fld1,fld2, fld3.

select * from origtable
EXCEPT
select fld1,fld2 from newtable

I was doing it on 7.1, but according to the manual, except is
supported starting at v5r4.

Cavats: the tables must have a primary key; or be a uniquely keyed
physical.

HTH,
Charles
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