Re: Columns in USING clause for join don't appear in SELECT *?

... and it takes the columns from the first specified table.
If you have a right outer join and there is no match, all key fields
(specified in the using clause are NULL!)

Mit freundlichen Grüßen / Best regards

Birgitta Hauser

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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Charles
Wilt
Sent: Freitag, 11. Mai 2018 19:05
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: Re: Columns in USING clause for join don't appear in SELECT *?

A few...not as many as I'd like...

Besides the problem posed by legacy RPG standards of specifing a different
prefix for the same field in different files...

The using clause on Db2 for i only supports a single join.

Meaning the following is not supported...

select *
from tbl1
join tbl2 using (fld1, fld2)
join tbl3 using (fld1, fld2)

It should be IMHO..

Perhaps requiring parenthesis to explicitly specify a join order...
select *
from (tbl1
join tbl2 using (fld1, fld2))
join tbl3 using (fld1, fld2)

Charles



On Fri, May 11, 2018 at 9:21 AM, Dan <dan27649@xxxxxxxxx> wrote:

Sorry, I meant Charles!

- Dan

On Fri, May 11, 2018 at 11:20 AM, Dan <dan27649@xxxxxxxxx> wrote:

Thanks for that, John! I can only guess that I've not done many
queries that fall in this category.

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