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SSRS Chart data and selections with no entries

Hello Experts Exchange
I am developing a SSRS Report that has categories and a sum of Total hours.  I select the data, that is OK, but I have categories that have no data against them but I want them to show up on the chart as a zero value.

I have a table of data that lists all the categories.

Is there a way I can select the categories that have no data for them and set the value to zero and still keep my categories with data too?

Regards

SQLSearcher
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SQLSearcher
Asked:
SQLSearcher
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1 Solution
 
Nico BontenbalCommented:
I suppose the data is in a SQL Server database. I think the easiest way is to use an outer join in your query to make sure all the categories are always returned in your dataset (with a zero value, if there is no data). This can be done with an outer join. See:
http://technet.microsoft.com/en-us/library/ms187518(v=sql.105).aspx
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SQLSearcherAuthor Commented:
Hello Nicobo
This is the SQL I have, but its not working as there is one category that is not coming back as zero.

SELECT   a.[Category], Isnull(SUM(b.[Total Lost Hours]),0) AS [Total Lost Hours]
FROM  [dbo].[MachineLosses_Level1] a       
left outer join MachineLosses_New b on a.[Category] = b.[level 1]
WHERE     ([File Name] IN ('Htr01 (581)', 'Htr04 (584)', 'Htr3 (583)', 'Htr9 (589)', 'UKL (593)'))
GROUP BY a.[Category]
ORDER BY [Total Lost Hours] DESC

Open in new window


Can you see where my error is?

Regards

SQLSearcher
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Nico BontenbalCommented:
The outer join makes sure all the categories are in the result. But the where clause filters the empty categories out of the result. You can solve this by using a subquery. Something like this:
select
    [Category], 
    ISNULL([Total Lost Hours],0) AS [Total Lost Hours]
from
    [dbo].[MachineLosses_Level1] cat left join
    (SELECT   a.[Category], Isnull(SUM(b.[Total Lost Hours]),0) AS [Total Lost Hours]
    FROM  [dbo].[MachineLosses_Level1] a       
    left outer join MachineLosses_New b on a.[Category] = b.[level 1]
    WHERE     ([File Name] IN ('Htr01 (581)', 'Htr04 (584)', 'Htr3 (583)', 'Htr9 (589)', 'UKL (593)'))
    GROUP BY a.[Category]
    ) sub on cat.[Category] = sub.[Category]
ORDER BY 
    [Total Lost Hours] DESC

Open in new window


Google for "derived table subquery sql server" for more information on the subject. There is an example on this page:
http://msdn.microsoft.com/en-us/library/ms177634.aspx
It's example I.
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SQLSearcherAuthor Commented:
Thank you very much for your help.
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