FIX: Create View with Nested SELECT in CASE Causes Error 206

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This article was previously published under Q156292

BUG #: 15817 (6.50)

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SYMPTOMS

If you create a view with a CASE statement, and one or more of the result expressions is a SELECT statement, the following error may occur:

Msg 206, Level 16, State 2
Operand type clash: UNKNOWN TOKEN is incompatible with varchar

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WORKAROUND

Use the CONVERT function to convert the result of the SELECT statement to the same datatype as the other result expressions.

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Microsoft has confirmed this to be a problem in Microsoft SQL Server version 6.5. This problem has been corrected in U.S. Service Pack 2 for Microsoft SQL Server version 6.5. For more information, contact your primary support provider.

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MORE INFORMATION

The following is an example of a CREATE VIEW command that will cause the error:

   CREATE VIEW select_in_case AS
   SELECT CASE
      WHEN 1=0 THEN "false"
      ELSE (SELECT "true")
      END "result"

To resolve the error, rewrite the query as:

   CREATE VIEW select_in_case AS
   SELECT CASE
      WHEN 1=0 THEN "false"
      ELSE CONVERT(varchar(255),(SELECT "true"))
      END "result"

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APPLIES TO

Microsoft SQL Server 6.5 Standard Edition

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kbbug kbfix kbusage KB156292

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Retired KB Content Disclaimer

This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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