Not really... It's quite easy to produce summary data in SQL....

Note all the fields that you need calculate a summary result. All of these fields will use functions like SUM(), MIN(), MAX(), AVG() and so forth.

All other fields (Keys, control breaks, etc.) need to specified in the Group By clause. All of these fields in the Group By, taken together, represent a DISTINCT grouping, and will result in a single row of the result set. It works the same way as using a DISTINCT clause in a simple select, where the DB finds every permutation of values that exist in the DB for those columns, and returns a single row for each unique grouping.

Here's a basic query using the Group By... The assignment might be worded like "Produce a listing of all active customers, showing total sales, cost, and a count of orders for the prior 12 months. Sort the list by total sales (descending)."


Select c.CustNo, c.CustName,
sum(s.InvTtl$) as TtlSls,
sum(s.InvCost) as TtlCost,
count(distinct s.Order#) as TtlOrders
From CustMst c left outer join
InvHist s on (c.CustNo=s.CustNo and s.OrDate >= (Current_Date - 1 years))
Where c.CustStatus = 'Active'
Group By c.CustNo, c.CustName
Order By 3 desc


This query returns a row for all "Active" customers in the CustMst file (see the Where clause), and joins to the Invoice history file to return Sales, Cost, and OrderCount, if any. The two tables are joined on the CustNo fields in both files, and is specified in the ON clause following the table being joined. Note the clause with OrDate; this limits the joined record to orders dated within the last year.

The placement of the date test is important. I put it in the ON clause, because putting it in the Where clause would cause our query to eliminate any rows where the join was null. Where clause applies to all rows in a result set. If we were to test s.OrDate >= (Current_Date - 1 years) in the Where clause, we would remove all customers that had no sales in the past year. By moving this to the ON clause, we can evaluate the date of invoice at the time that we select the records to join. If a record fails to match the criteria, it is omitted from the joined result.

The Group By lists the control break fields, and finally, the returned result set is ordered descending on the third column in the result (Total Sales).

hth,
Eric

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of Fleming, Greg (ED)
Sent: Tuesday, October 02, 2007 8:22 AM
To: Midrange Systems Technical Discussion
Subject: RE: Summary Output with STRQMQRY


We're using STRQMQRY because we need to pass a parameter, and can't do
it with RUNQRY.

However, I reckon it may be easiest to just modify my query to produce a
file with the detail, then create a second query to summarize it to
printed output. Since the second query won't require a parameter, we
can just use RUNQRY on it.

Thanks

|-----Original Message-----
|From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
|bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
|Sent: Tuesday, October 02, 2007 9:04 AM
|To: Midrange Systems Technical Discussion
|Subject: Re: Summary Output with STRQMQRY
|
|If you're using a Query/400 definition, and you're not using RTVQMQRY
or
|some such thing, then why are you using STRQMQRY and not RUNQRY?
|If you ARE using RTVQMQRY, then you should modify the statement
produced
|and use GROUP BY.
|
|Rob Berendt
|--
|Group Dekko Services, LLC
|Dept 01.073
|PO Box 2000
|Dock 108
|6928N 400E
|Kendallville, IN 46755
|http://www.dekko.com
|
|
|
|
|
|"Fleming, Greg \(ED\)" <GFLEMING@xxxxxxxxxxxxxxxxxxxx>
|Sent by: midrange-l-bounces@xxxxxxxxxxxx
|10/02/2007 08:54 AM
|Please respond to
|Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
|
|
|To
|"Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
|cc
|
|Fax to
|
|Subject
|Summary Output with STRQMQRY
|
|
|
|
|
|
|We're using STRQMQRY on a Query/400 QRYDFN. The query when run from
|Query/400 is defined to return summary records only, but when run from
|STRQMQRY in a CL program (or interactively), it returns detail.
|
|I found a post from 2003 which indicated a similar problem, and
|suggested running RTVQMFORM to generate a source file from the QRYDFN,
|then using CRTQMFORM to create a form to use on the STRQMQRY QMFORM
|parameter. I tried that, but I still get detail.
|
|Is there anyway to make this thing give me summary records only ?
|
|Thanks
|
|Greg Fleming
|
|Senior Programmer/Analyst
|
|Everglades Direct, Inc.
|
|
|
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|This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
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