# SQL SUM Question Group By

Good afternoon,

I have a query where I do the following:
SELECT CustomerID,
SUM(Cost) Cost,
SUM(Quantity) Quantity,
LongShort,
SUM(Alpha) Alpha
FROM Customer
GROUP BY CustomerID, LongShort

What I need to do is if CustomerID = 1 then I want to make the LongShort return 'L' if the SUM(Quantity) >= 0 ELSE 'S' otherwise return the LongShort as it is.   How can I do this because I can't place the SUM in the Group by with a CASE statement?  I am trying to avoid doing nested queries etc. if possible.
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DeveloperCommented:
You can wrap your query in another SELECT that returns the results you want:

``````SELECT CustomerID, Cost, Quantity,Alpha
,CASE WHEN CustomerID = 1 AND Quantity >= 0 THEN 'L' WHEN CustomerID = 1 THEN 'S' ELSE LongShort END AS LongShort
FROM (
SELECT CustomerID,
SUM(Cost) Cost,
SUM(Quantity) Quantity,
LongShort,
SUM(Alpha) Alpha
FROM Customer
GROUP BY CustomerID, LongShort
) u
``````

You may need to aggregate again since you are grouping by LongShort:

``````SELECT u.CustomerID, SUM(u.Cost) AS Cost, SUM(u.Quantity) as Quantity,SUM(u.Alpha) AS Alpha
,CASE WHEN u.CustomerID = 1 AND u.Quantity >= 0 THEN 'L' WHEN u.CustomerID = 1 THEN 'S' ELSE u.LongShort END AS LongShort
FROM (
SELECT CustomerID,
SUM(Cost) Cost,
SUM(Quantity) Quantity,
LongShort,
SUM(Alpha) Alpha
FROM Customer
GROUP BY CustomerID, LongShort
) u
GROUP BY u.CustomerID, CASE WHEN u.CustomerID = 1 AND u.Quantity >= 0 THEN 'L' WHEN u.CustomerID = 1 THEN 'S' ELSE u.LongShort END
``````
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Technology ScientistCommented:
You will need a subquery (with an alias) since a HAVING clause won't do the trick.

`````` SELECT
t2.CustomerID
, t2.Cost
, t2.Quantity
, "LongShort" =
CASE
WHEN t2.CustomerID = 1 THEN "L"
WHEN t2.Quantity >= 0 THEN "S"
ELSE t1.LongShort
END
, t2.Alpha
FROM Customer t1
INNER JOIN
(
SELECT
CustomerID,
, SUM(Cost) Cost,
, SUM(Quantity) Quantity,
, SUM(Alpha) Alpha
FROM Customer
GROUP BY CustomerID
) t2
ON t1.CustomerID = t2.CustomerID
``````
0
Associate Principal EngineerCommented:
Hello,

You can try the below query

``````SELECT CustomerID,
SUM(Cost) Cost,
SUM(Quantity) Quantity,
LongShort,
SUM(Alpha) Alpha,
CASE WHEN CustomerID = 1 THEN
CASE WHEN SUM(Quantity) >=0 THEN 'L' ELSE 'S' END
ELSE LongShort END AS LongShortNew
FROM Customer
GROUP BY CustomerID, LongShort
``````
0
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