Re: Can an SQL common table expression be used for many different selects?

@Jon
I already use GET DIAGNOSTICS, which @Vernon very well clarified, to know
the number of rows in the result set; but in this specific case, as the
article said towards the end, it seems that GET DIAGNOSTICS returns the
number of fetched rows, which may be affected by offset and rows only,
instead of the total number of rows of the result set.

GET DIAGNOSTICS is well explained in "Database Db2 for i SQL Reference",
but I can't really see if any of the other allowed information will answer
this question, at least.

Thank you all

Il giorno mar 28 lug 2020 alle ore 14:12 Vernon Hamberg <
vhamberg@xxxxxxxxxxxxxxx> ha scritto:

Hi all, to clarify -

GET DIAGNOSTICS is not an API call - it is an SQL statement, as this
info from the 7.1 reference says -

The GET DIAGNOSTICS statement obtains information about the previous
SQL statement that was executed.

And this further from the documentation -

Instead of using an SQLCA, the GET DIAGNOSTICS statement can be used
in all languages to return return codes and other information about
the previous SQL statement.

GET DIAGNOSTICS was available sometime after V5R1 (I still have that
reference manual) and before V6R1.

In SQLCA there are a set of 6 integer variables (SQLER1 - SQLER6) that
return diagnostic information. For different statements each integer can
have different meaning.

On 7/28/2020 5:11 AM, Patrik Schindler wrote:

Hello Maria,

Am 28.07.2020 um 11:56 schrieb Maria Lucia Stoppa <mlstoppa@xxxxxxxxx>:

I'm already reading the SQL technical reference, you might be referring

to GET DIAGNOSTICS, but I haven't found anything interesting yet. I'll keep
on studying.

I was referring to the manual about using SQL in HLLs. AFAIR, there's

one or more DS' documented which give you access to a lot of internal
variables, like SQLCOD and the like. GET DIAG sounds more like an API call.

The results may not be the same due to the filtering process. The

result set is the same for 8 to 10 different select statements within the
same run though, that's why I hoped the same "with" table could be used for
all of them. Maybe, a global temporary table is of help, or a view to the
database already grouped by.

I guess, this is too abstract for me to come up with a solution. Maybe

Birgitta can help. Or you need to provide actual examples. But even then, I
don't know if my skills are sufficient.

:wq! PoC

PGP-Key: DDD3 4ABF 6413 38DE - https://www.pocnet.net/poc-key.asc

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