FIX: Error message when you run a query that uses the CASE function in SQL Server 2008: "Conversion failed when converting the <Type1> value ‘<A value>’ to data type <Type2>."

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Article ID: 969467 - View products that this article applies to.
Microsoft distributes Microsoft SQL Server 2008 fixes as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 fix release.
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SYMPTOMS

In Microsoft SQL Server 2008, when you run a query that uses the CASE function, you may receive an incorrect result, or you may receive the following error message:
Msg 245, Level 16, State 1, Line 1

Conversion failed when converting the <Type1> value ‘<A value>’ to data type <Type2>.
Note This issue also occurs in SQL Server 2005 and in some versions of SQL Server 2000. This issue does not occur in SQL Server versions that are earlier than SQL Server 2000 build 2148.

RESOLUTION

Cumulative update information

The release version of SQL Server 2008

Important You must install this cumulative update package if your computer is running the release version of SQL Server 2008.

The fix for this issue was first released in Cumulative Update 5. For more information about how to obtain this cumulative update package for SQL Server 2008, click the following article number to view the article in the Microsoft Knowledge Base:
969531 Cumulative update package 5 for SQL Server 2008
Note Because the builds are cumulative, each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 fix release. We recommend that you consider applying the most recent fix release that contains this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
956909 The SQL Server 2008 builds that were released after SQL Server 2008 was released

SQL Server 2008 Service Pack 1

Important You must install this cumulative update package if your computer is running SQL Server 2008 Service Pack 1.

The fix for this issue was also later released in Cumulative Update 3 for SQL Server 2008 Service Pack 1. For more information about this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:
971491 Cumulative update package 3 for SQL Server 2008 Service Pack 1
Note Because the builds are cumulative, each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 fix release. Microsoft recommends that you consider applying the most recent fix release that contains this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
970365 The SQL Server 2008 builds that were released after SQL Server 2008 Service Pack 1 was released
Microsoft SQL Server 2008 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2008 Service Pack 1 hotfix to an installation of SQL Server 2008 Service Pack 1. By default, any hotfix that is provided in a SQL Server service pack is included in the next SQL Server service pack.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information about the same issue in SQL Server 2005, click the following article number to view the article in the Microsoft Knowledge Base:
969466 FIX: Error message when you run a query that uses the CASE function in SQL Server 2005: "Conversion failed when converting the <DateType> value '<Value>' to data type <DataType>"
No hotfix is available for SQL Server 2000 because Microsoft only offers limited support according to support life cycle. If you encounter the same issue in SQL Server 2000 versions that are later than SQL Server 2000 build 2148, modify your query to work around the issue.

REFERENCES

For more information about the Incremental Servicing Model for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:
935897 An Incremental Servicing Model is available from the SQL Server team to deliver hotfixes for reported problems
For more information about the naming schema for SQL Server updates, click the following article number to view the article in the Microsoft Knowledge Base:
822499 New naming schema for Microsoft SQL Server software update packages
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 969467 - Last Review: July 21, 2009 - Revision: 2.0
APPLIES TO
  • Microsoft SQL Server 2008 Standard
  • Microsoft SQL Server 2008 Enterprise
  • Microsoft SQL Server 2008 Developer
  • Microsoft SQL Server 2008 Workgroup
Keywords: 
kbsurveynew kbexpertiseadvanced kbqfe kbfix KB969467

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