Latest revision as of 09:45, 21 July 2020

Knowledge Base

FIX: Query Using Nested IN and a CASE Clause Causes an Access Violation

Article ID: 279319

Article Last Modified on 3/14/2006

APPLIES TO

Microsoft SQL Server 7.0 Standard Edition

This article was previously published under Q279319

BUG #: 57966 (SQLBUG_70)

SYMPTOMS

Running a query with two or more nested IN clauses and a CASE statement may cause the connection to be broken and the following error to be returned:

ODBC: Msg 0, Level 19, State 1
SqlDumpExceptionHandler: Process 7 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process. Connection Broken

CAUSE

The query caused a handled exception in SQL Server, and the process was stopped.

WORKAROUND

To work around this problem, replace the IN clause with a SELECT COUNT(1) > 0 statement. For example, part of the query that looks like the following:

CASE
   WHEN T1.F1 IN (SELECT T2 FROM T2) THEN value1
   ELSE value2
END

Can be rewritten as:

CASE
   WHEN (SELECT COUNT(1) FROM T2 WHERE T1.F1 = T2.F2) > 0 THEN value1
   ELSE value2
END

STATUS

Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 3 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

274799 INF: How to Obtain Service Pack 3 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0

For more information, contact your primary support provider.

Additional query words: Query Processor Exception AV sqlserver

Keywords: kbbug kbfix KB279319

@@ Line 69: / Line 69: @@
 == WORKAROUND ==
-To work around this problem, replace the IN clause with a SELECT COUNT(1) &gt; 0 statement. For example, part of the query that looks like the following:
+To work around this problem, replace the IN clause with a SELECT COUNT(1) > 0 statement. For example, part of the query that looks like the following:
 <pre class="codesample">CASE
     WHEN T1.F1 IN (SELECT T2 FROM T2) THEN value1
@@ Line 77: / Line 77: @@
 Can be rewritten as:
 <pre class="codesample">CASE
-    WHEN (SELECT COUNT(1) FROM T2 WHERE T1.F1 = T2.F2) &gt; 0 THEN value1
+    WHEN (SELECT COUNT(1) FROM T2 WHERE T1.F1 = T2.F2) > 0 THEN value1
     ELSE value2
 END

Microsoft KB Archive/279319: Difference between revisions