sql join with sum

I am trying to join information from several tables.  
the main table (tblProject) has a project ID for every project... one of the other tables has a list volumes added for that project.  Each time you add to it another entry is made for that project ID.... I am trying to pull back a single line for each project ID that will include adding up the total (sum) of all the entrees from the other table.. here is what i have so far
the first section is just joining information from the three tables.. the second is my trying to figure out how to sum
thanks for the help
(without sum)
select tblProject.KEYField,tblProject.ProjectID,tblProject_Type.Name as 'Project Type',tblProject.Name as 'Project Name',tblTract1.Name as 'Primary Tract', tblProject.Status, tblProject.Acres, tblProject.Est_TOTAL as 'Est Vol'
from tblproject
inner join tblProject_Type
on tblProject.FKEYProjectType=tblProject_Type.KEYField
inner join tblTract1
on tblproject.Primary_Tract=tblTract1.KEYField

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now with sum
select tblProject.KEYField,tblProject.ProjectID,tblProject_Type.Name as 'Project Type',tblProject.Name as 'Project Name',tblTract1.Name as 'Primary Tract', tblProject.Status, tblProject.Acres, tblProject.Est_TOTAL as 'Est Vol',sum(tblProject_Volume.Volume)as 'Sum'
from tblproject
inner join tblProject_Type
on tblProject.FKEYProjectType=tblProject_Type.KEYField
inner join tblTract1
on tblproject.Primary_Tract=tblTract1.KEYField
inner join tblProject_Volume
on tblProject.ProjectID=tblProject_Volume.FKEYProject
group by
tblProject.KEYField

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David ModugnoAsked:
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Scott PletcherSenior DBACommented:
You need to move the sum down into a subquery, like so:

select p.KEYField,p.ProjectID,pt.Name as 'Project Type',p.Name as 'Project Name',
    t.Name as 'Primary Tract', p.Status, p.Acres, p.Est_TOTAL as 'Est Vol', pv.Volume as 'Sum'
from tblproject p
inner join tblProject_Type pt
on p.FKEYProjectType=pt.KEYField
inner join tblTract1 t
on p.Primary_Tract=t.KEYField
left outer join (
    select FKEYProject, SUM(Volume) AS Volume
    from tblProject_Volume
    group by FKEYProject
) AS pv
on p.ProjectID=pv.FKEYProject
group by
p.KEYField
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David ModugnoAuthor Commented:
I get this error when i run it
Column 'tblproject.ProjectID' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause
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Scott PletcherSenior DBACommented:
That string doesn't appear in my query anywhere.  Even if you converted my aliases back into full names, I don't see how that error would occur in my code.

Please post the text of the query, since otherwise it's almost impossible for me to debug.
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David ModugnoAuthor Commented:
I copied your query directly.. here is a screen shot of the error with the query
sql-query.jpg
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Scott PletcherSenior DBACommented:
D'OH, I'm so sorry, I forgot to remove the GROUP BY from the main query:

select p.KEYField,p.ProjectID,pt.Name as 'Project Type',p.Name as 'Project Name',
     t.Name as 'Primary Tract', p.Status, p.Acres, p.Est_TOTAL as 'Est Vol', pv.Volume as 'Sum'
from tblproject p
 inner join tblProject_Type pt
 on p.FKEYProjectType=pt.KEYField
 inner join tblTract1 t
 on p.Primary_Tract=t.KEYField
left outer join (
     select FKEYProject, SUM(Volume) AS Volume
     from tblProject_Volume
     group by FKEYProject
 ) AS pv
 on p.ProjectID=pv.FKEYProject
--group by /* I should have deleted the GROUP BY, DOH! */
-- p.KEYField
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David ModugnoAuthor Commented:
not i get this - little confused by this .... is it relating to the sum... that is an "int"
Msg 245, Level 16, State 1, Line 3
Conversion failed when converting the nvarchar value '0001-10' to data type int.
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Scott PletcherSenior DBACommented:
That's likely caused by one of the joins.  (At least) one of those joined columns must be nvarchar and not int.  If garbage can get into a column, it will get into a column :-).

Review the data type of "Volume" and all columns involved in the table joins.
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David ModugnoAuthor Commented:
I looked at the joins....
p.FKEYProjectType=pt.KEYField = both int
p.Primary_Tract=t.KEYField = both int

that leaves the sum....
don't know if this will help at all... but if i was to just run the sum... this is the result i would expect to see next to the results for one of the project
select SUM(Volume)as Volume
from tblProject_Volume
where FKEYProject = 1434

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returns 3187

the entire query that i'm working on should bring back one line for each project and the last column would be that sum from tblProject_Volume .... i hope im not making this more confusing

the volume column in that table is also an int

thanks for all your help on this
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Scott PletcherSenior DBACommented:
What about pv.FKEYProject?
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David ModugnoAuthor Commented:
also int
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Scott PletcherSenior DBACommented:
Check those tables for a column with:
a data type of nvarchar  and
a (max_length >= 7 or max_length = 1).

For example:

SELECT OBJECT_NAME(c.object_id) AS table_name, c.*
FROM sys.columns c
INNER JOIN sys.types t on
    t.system_type_id = c.system_type_id AND
    t.user_type_id = c.user_type_id
WHERE
    OBJECT_NAME(c.object_id) IN (' tblproject ', 'tblProject_Type', 'tblTract1', 'tblProject_Volume')  AND --other tables need added?
    t.name LIKE '%nchar%' AND
    (c.max_length = -1 or c.max_length >= 7)

Then see if any of those columns are referenced in the query.
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Microsoft SQL Server

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