FIX: Error 8630 When Querying A View Created with a UNION Clause (247056)

The information in this article applies to:

Microsoft SQL Server 7.0

This article was previously published under Q247056

BUG #: 55934 (SQLBUG_70)

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.

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.

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 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.

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

Modification Type:	Major	Last Reviewed:	3/14/2006
Keywords:	kbBug kbfix KB247056