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SSRS Chart data and selections with no entries

Posted on 2014-10-02
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Last Modified: 2014-10-03
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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Question by:SQLSearcher
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Expert Comment

by:Nico Bontenbal
ID: 40358842
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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Author Comment

by:SQLSearcher
ID: 40358872
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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Accepted Solution

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Nico Bontenbal earned 500 total points
ID: 40359169
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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Author Closing Comment

by:SQLSearcher
ID: 40359292
Thank you very much for your help.
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