Re: SQL: how to join header and detail records

The syntax given is the old one, where JOINs are done implicitly with a list of tables and something in the WHERE clause, where the ON stuff would go.

It's much clearer to use true JOIN syntax, IMO.

----- Original Message -----
Don't I need a JOIN in there???

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Tommy.Holden@xxxxxxxxxxxxxxxxxxxxx
Sent: Wednesday, April 03, 2013 12:00 PM
To: Midrange Systems Technical Discussion
Subject: Re: SQL: how to join header and detail records

Perhaps something like:

With t1 as (select keyfld, sum(dtlqty) as dtlqty from dtlfile)
Select a.keyfld, a.totqty, b.dtlqty from hdr a, t1 b


Thanks,
Tommy Holden



From: "Stone, Joel" <Joel.Stone@xxxxxxxxxx>
To: "'Midrange Systems Technical Discussion'"
<midrange-l@xxxxxxxxxxxx>,
Date: 04/03/2013 11:56 AM
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!



______________________________________________________________________
This outbound email has been scanned for all viruses by the MessageLabs
Skyscan service.
For more information please visit http://www.symanteccloud.com
______________________________________________________________________