SQL sum INNER JOIN column

Consider the following:

tblEntity
entityid int pk
entityname varchar
userid varchar

tblProducts
productid int pk
productDesc varchar
productPrice decimal

tblEntityProducts
epid int pk
entityid int fk
productid int fk

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tblEntity
1 Famco bill
2 HatWagons joe
3 Stinkco bill

tblProducts
1 Corn 3.00
2 Hamster 4.00
3 Microscope 10.00

tblEntityProducts
1 1 1
2 1 2
3 2 2
4 2 3
5 3 3

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Based on input of userid bill, I am looking for a query to get expected result of

Famco bill 7.00
Stinkco bill 10.00

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I can results of
Famco bill 3.00
Famco bill 4.00
Stinkco bill 10.00

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Using code

SELECT     e.entityid, e.userid, p.productPrice, z.productid
FROM         tblEntity AS e INNER JOIN
                      tblEntityProducts AS z ON z.entityid = e.entityid INNER JOIN
                      tblProducts AS p ON z.productid = p.productid
WHERE     (e.userid = 'bill')

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But if I try to add any GROUP BY or SUM functions, it throws "Column is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause."

Any ideas?  Can provide further info if needed.  Thank you
alrightAsked:
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_agx_Commented:
Don't include the other columns. If you want to SUM the price by entityName, only include those two columns:


SELECT  e.entityname, SUM(p.ProductPrice) AS TotalPrice
FROM       tblEntity e 
		INNER JOIN tblEntityProducts z ON z.entityid = e.entityid 
                INNER JOIN tblProducts p ON z.productid = p.productid
WHERE     (e.userid = 'bill')
GROUP BY e.entityname 

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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
As you also want to see the userid:
SELECT  e.entityID, e.userid, SUM(p.ProductPrice) AS TotalPrice
FROM       tblEntity e 
		INNER JOIN tblEntityProducts z ON z.entityid = e.entityid 
                INNER JOIN tblProducts p ON z.productid = p.productid
WHERE     (e.userid = 'bill')
GROUP BY e.entityID, e.userid

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But using entityname instead of entitiyID, as _agx_ did, sounds more reasonable.
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Vitor MontalvãoMSSQL Senior EngineerCommented:
For what you want the following query is the solution:
SELECT  e.entityname, e.userid, SUM(p.ProductPrice) AS TotalPrice
FROM       tblEntity e 
		INNER JOIN tblEntityProducts z ON z.entityid = e.entityid 
                INNER JOIN tblProducts p ON z.productid = p.productid
WHERE     (e.userid = 'bill')
GROUP BY e.entityname, e.userid

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The explanation for that error is in SQL Server if you want to use an aggregate function (MAX, MIN, SUM, COUNT) you will always need to create a GROUP BY clause with the rest of the fields that your SELECT is returning with the exception of the aggregate functions.
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alrightAuthor Commented:
Thank you for the assistance and the explanation.  Makes perfect sense now
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
You did take notice of the fact that _agx_'s suggestion does not return the desired result as requested?
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_agx_Commented:
@Qlemo - Hah, you're right. All this time I thought the sample data value "Famco bill" was the entityName - not entityName + userID.  I couldn't figure out why you added userID to your query ;-)
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Yes, that kind of display is obfuscating.
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Microsoft SQL Server 2005

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