Re: SQL: how to join header and detail records

It's the nature of the beast... if you prefer you could instead do a
subselect on the detail.

with cte as (
select order, totqty, (select sum(dtlqty) from detail where header.order =
detail.order) as dtlqty
)
select * from cte where totqty <> dtlqty





On Wed, Apr 3, 2013 at 1:26 PM, Stone, Joel <Joel.Stone@xxxxxxxxxx> wrote:

Yes I agree MAX/MIN would work, so would AVG. But it just doesn't seem
very self-documenting. If someone else were to look at it a year later,
they may be steered down the thought path that the developer was trying to
do something other than use the simple column value.



-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:
midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Michael Schutte
Sent: Wednesday, April 03, 2013 12:21 PM
To: Midrange Systems Technical Discussion
Subject: Re: SQL: how to join header and detail records

You would either need to MAX/MIN totqty or put it in the GROUP BY.

I would MIN or MAX, it wouldn't matter because it would return the same
value every time.


On Wed, Apr 3, 2013 at 1:09 PM, <rob@xxxxxxxxx> wrote:

The magic word is HAVING.
HAVING is to GROUP as ... well, not really a good comparison. Just let

me

explain it to you

Select orderno, totqty, sum(dtlqty) as dtlsum
from orderheader join orderdetail using orderno
group by orderno
having totqty <> dtlsum

Now, you may have to say
<> sum(dtlqty)
but you should get the concept from that.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: "Stone, Joel" <Joel.Stone@xxxxxxxxxx>
To: "'Midrange Systems Technical Discussion'"
<midrange-l@xxxxxxxxxxxx>,
Date: 04/03/2013 12:59 PM
Subject: SQL: how to join header and detail records
Sent by: midrange-l-bounces@xxxxxxxxxxxx



I have an order header and detail file with one to many.

The order header has TOTQTY, which is the sum of all detail quantities.

The order detail has DTLQTY, which is one line's qty.



If I do a join of the two files and there is one HDR and five DTL

records,

there will now be FIVE rows.

I want to compare the sum of the DTLQTY to the single TOTQTY value.

I can use SUM(DTLQTY) to provide the sum of the detail.

What is a good way to provide the TOTQTY? I don't want to use

SUM(TOTQTY)

as this would give a result 5 times the correct value.

Is MAX(TOTQTY) what people generally use?

But that seems to be misleading since I am not really looking for the max
value, as all rows contain the same value for a header column.

Should I be grouping the detail PRIOR to the join, so there is only ONE
header value?

But it seems like the SQL stmt is SO much simpler if I do the join first.

Any ideas?

Thanks!



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