Article ID: 247056 - Last Review: March 14, 2006 - Revision: 2.1

FIX: Error 8630 When Querying A View Created with a UNION Clause

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This article was previously published under Q247056
BUG #: 55934 (SQLBUG_70)

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SYMPTOMS

When you run a SELECT statement to retrieve data from a view, the following error message may appear:
Server: Msg 8630, Level 17, State 38, Line 1
Internal Query Processor Error: The query processor encountered an unexpected error during execution.
This error may occur if the following conditions are true:
  • The view was created using a UNION clause.

    -and-
  • The SELECT statement used to retrieve data from the view has a subquery in its WHERE clause.
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WORKAROUND

To work around this problem, try one of the following:
  • Query the table rather than the view.
  • Avoid creating the view with the UNION clause.
  • Avoid using a subquery in the WHERE clause.
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STATUS

Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 2 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
254561  (http://support.microsoft.com/kb/254561/ ) INF: How to Obtain Service Pack 2 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0
For more information, contact your primary support provider.
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MORE INFORMATION

Steps to Reproduce the Problem

The following script demonstrates the problem: 
Create Table table1(a int, b int)
go
Create Table table2(c int, d int)
go

Create View view1 as 
Select a, b From table1
Union
Select a, b From table1
go

--The following query reproduces the error

Select a From view1 where
a <> (select c from table2 where d = b) and
a <> (select c from table2 where d = b)
go
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APPLIES TO
  • Microsoft SQL Server 7.0 Standard Edition
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Keywords: 
kbbug kbfix KB247056
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