Re: how to retrieve records and make sure they arrive in RRN sequence

[Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>]

Hi Joel

Yes, the ORDER BY has to use a column name from the result set - so you 
can use an AS after the RRN() to give it a name.

Or, on iSeries only, you can use the ordinal position number. See my 
other post for the AS thing.

But remember that RRN is specific to each file - it is not global over 
the system, so again, see my other post.

Vern

On 2/12/2013 4:59 PM, Stone, Joel wrote:
> Thanks but I have no key - I want to ensure RRN.
>
> I have tried to add ORDER BY RRN but it doesn't seem to like it.  Is there a trick to get ORDER BY RRN to work?  Must ORDER BY contain only fields in the record?
>
>
> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DeLong, Eric
> Sent: Tuesday, February 12, 2013 4:49 PM
> To: Midrange Systems Technical Discussion
> Subject: RE: how to retrieve records and make sure they arrive in RRN sequence
>
> Specify an ORDER BY clause after the second statement in your UNION...
>
> Arrival sequence means NOTHING in sql.  Never count on it, even if it LOOKS like you're getting what you want.  The only way to ensure an ordered result is to specify the ORDER BY clause.
>
> -Eric DeLong
>
> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Stone, Joel
> Sent: Tuesday, February 12, 2013 4:33 PM
> To: 'Midrange Systems Technical Discussion'
> Subject: SQL: how to retrieve records and make sure they arrive in RRN sequence
>
> Normally records seem to arrive in RRN sequence - if no other ORDER BY is stated.
>
> However, when I use UNION to concat two SELECT results together, they are arriving in a random sequence.
>
> How can I assure that the result set is in RRN seq?
>
> However, I don't think I can include RRN in the SELECT because that field is NOT in the result table.
>
> Thanks
>
>
>
> create table qtemp/memotext as
> (select * from mdcmdct
>   union
>   select * from mdcmtx1
>
>                                 )      with data;
>
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