I do not see any advantage with CTE, View, etc. They seem to complicate
things unnecessarily without adding any benefit in this case. I advise our
programmers to do calculation first and then join with master tables in
last step. This reduces amount of memory required for sort and will help
when millions of records are involved. See the following SQL to get an idea
about what I am suggesting.

Also, you might want to follow Vern's advice (using Visual Explain) and
check any new indexes are needed. As explained by Vern, indexes are
critical for performance.

SELECT a.lineSeq,
SELECT substr(idept,1,1) as lineSeq,
min(dhloc) as location,
sum(dhsell*dhqty) + Sum(aSell * aQty) as Sales_Amt,
sum(dhcost*dhqty) + Sum(aCost * aQty) as Cost_Amt,
(cast( ( sum(dhsell*dhqty) + Sum(aSell * aQty) ) - (sum(dhcost*dhqty) +
Sum(aCost * aQty)) as double) / cast(sum(dhcost*dhqty) + Sum(aCost * aQty)
as double)) as Margin
from dbslsdlg left join KCX340D.dbprodpf on dhino = ino
Left Join DBSLSDXL1 b on aINo = ino
where dhdate >= 20150701 and dhdate <= 20150730
AND aDate >= 20150701 and aDate <= 20150730
group by substr(idept,1,1)
) a
Left join dbdeptpf on a.lineseq = deptno
order by 1;

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