Try this:
select a.prodcode, sum(a.ordqty) totqty,
count (distinct c.ordnum) numOrders
from ordDetail a
group by a.prodcode

Mit freundlichen Grüßen / Best regards

Birgitta Hauser

"Shoot for the moon, even if you miss, you'll land among the stars." (Les
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"
?Train people well enough so they can leave, treat them well enough so they
don't want to.? (Richard Branson)

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Steve
Sent: Montag, 11. November 2019 15:34
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: how summarize and count distinct in same SQL statement

when summarizing an order detail file on PRODCODE, how get both a summary of
ORDQTY and a count of distinct order numbers?

the end result I want is this:

PRODCODE Number orders Order qty
-------- ------------- ---------
Y98392 5 252
T89523 7 8183

I tried to do a count of a sub select where I select distinct ORDNUM on the
PRODCODE being grouped, but DB2 did not allow:

select a.prodcode, sum(a.ordqty) totqty,
count( select distinct c.ordnum
from ordDetail c
where c.prodcode = a.prodcode ) numOrders
from ordDetail a
group by a.prodcode
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