× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



I was attempting to do a sub select, but I clicked run too soon.
the first time or two I thought it was erroring out.

btw...
this morning, I ran the query without parens, and it ran in 1 second,
using the SQE... I do think that yesterday it was using CQE.

that has been the history of this query... most days it runs in 1 second,
but every now and then (appears to be if we have had heavy activity on the
BOM file)
the jobs takes 30 to 45 minutes...



On Fri, Jun 19, 2015 at 7:29 AM, <darren@xxxxxxxxx> wrote:

I didn't know putting parenthesis around a statement, excluding the order
by, could make any difference. There have been times when I get a few
results against a larger table, then I remember that I forgot the "order
by", so I add it and I watch it take much longer to produce the results.
In my mind, I say, why doesn't it just generate the results it did last
time, and then order those results, rather than sorting the whole table to
give me a sorted short list. Is this a trick I could use to improve query
performance when needing an unindexed sort order with a small result list?






From: Gerald Magnuson <gmagqcy.midrange@xxxxxxxxx>
To: midrange-l@xxxxxxxxxxxx
Date: 06/18/2015 02:08 PM
Subject: sql - why doesn't the query engine know this???
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



so I have a bill of material query (parent, child) joining to a item
master file (twice, once on parent, once on child) and a status file(
joined on parent)... I want the list ordered by parent...

select parent,child,t02.desc,t03.desc,osipo# from
plan_bill t01
join items t02 on t02.item = t01.parent
join items t03 on t03.item = chlid
join ordstatus t04 on ositm# = t01.parent
where
parent like '%MTG%' and
child like 'S%' and
osid = 'OS'
order by bprod ;

I have built all advised indexes, and when I run it takes 30 minutes to
return 800 records.
however, when I take off the order by, it runs in 2 seconds.
then, I tried: (parens around select statement)

(select parent,child,t02.desc,t03.desc,osipo# from
plan_bill t01
join items t02 on t02.item = t01.parent
join items t03 on t03.item = chlid
join ordstatus t04 on ositm# = t01.parent
where
parent like '%MTG%' and
child like 'S%' and
osid = 'OS' )
order by bprod ;

and that ran in 2 seconds...
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.



--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.



As an Amazon Associate we earn from qualifying purchases.

This thread ...

Follow-Ups:
Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.