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FIX: Coalesce with Subquery May Generate an Access Violation

Article ID: 298803 - View products that this article applies to.

This article was previously published under Q298803

BUG #: 352326 (SHILOH_BUGS)

SYMPTOMS

When you run a coalesce query that contains a subquery the following error message may occur:

ODBC: Msg 0, Level 19, State 1
SqlDumpExceptionHandler: Process 52 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process.

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RESOLUTION

To resolve this problem, obtain the latest service pack for SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

290211

(http://support.microsoft.com/kb/290211/EN-US/ )

INF: How to Obtain the Latest SQL Server 2000 Service Pack

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WORKAROUND

Change the query so that it uses CASE WHEN or IF ELSE statements instead. For example:

CASE
   WHEN (expression1 IS NOT NULL) THEN expression1
   ...
   WHEN (expressionN IS NOT NULL) THEN expressionN
   ELSE NULL

-or-

IF (expression1 IS NOT NULL) expression1
   ELSE 
   IF (expression2 IS NOT NULL) expression2
   ...
   ELSE NULL

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STATUS

Microsoft has confirmed that this is a problem in SQL Server 2000. This problem was first corrected in SQL Server 2000 Service Pack 1.

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MORE INFORMATION

To reproduce the problem, use this code:

USE northwind
GO
SELECT COALESCE 
    ((SELECT COUNT(p.productid)
      FROM  Products p 
      INNER JOIN Suppliers s 
      ON p.supplierid = s.supplierid 
      WHERE city = 'London' ),0)
GO

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