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Editorial Team
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Asked: 2026-05-13T09:01:25+00:00

Next query runs successfully: select top(100) * from PackageSessionNodes where Cast(ContentInteractions as nvarchar) !=

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Next query runs successfully:

select top(100) * from PackageSessionNodes 
where Cast(ContentInteractions as nvarchar) != ''

Next gives me error
Target string size is too small to represent the XML instance

update PackageSessionNodes set ContentInteractions = '<contentinteractions />'
where Cast(ContentInteractions as nvarchar) = ''

ContentInteractions is an xml column. No DDT defined on it.

How can I solve the second query so that I get those records with ” as xml?

I seems like SqlServer cannot deal with empty values that are stores in a xml column… but you can insert them… how’s that?

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1 Answer

  1. Editorial Team

    The problem is with your CAST. When you don’t specify the length of nvarchar, it defaults to 30 characters in the CAST-function. So what what your statement really says is 

    update PackageSessionNodes set ContentInteractions = '<contentinteractions />'
where Cast(ContentInteractions as nvarchar(30)) = ''

    So if the XML-content of ContentInteractions is serialized to more than 30 characters, you get this problem.

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