Article ID: 822746
Article Last Modified on 11/2/2007
APPLIES TO
- Microsoft SQL Server 2000 Developer Edition
- Microsoft SQL Server 2000 Standard Edition
- Microsoft SQL Server 2000 Enterprise Edition
- Microsoft SQL Server 2000 Personal Edition
- Microsoft SQL Server 2000 Enterprise Edition
- Microsoft SQL Server 2000 Workgroup Edition
- Microsoft SQL Server 2000 Desktop Engine (Windows)
- Microsoft SQL Server 2000 Developer Edition
- Microsoft SQL Server 2000 Enterprise Edition 64-bit
SYMPTOMS
You may receive incorrect results, if your query meets the following conditions:
- The query specifies a UNION or a UNION ALL of two or more inputs.
- In the UNION, at least one of the SELECT statements return the parameter or variable value (that is, it uses this value in the select list and not in the where clause).
- The column returning the variable or parameter value is being used as a join or grouping column higher in the query tree, and this operator is run in parallel, requiring that the data stream be partitioned based on the join or grouping columns.
The following query is an example of one that is subject to this problem:
DECLARE @a SMALLINT
SET @a=1
SELECT yy, COUNT(*)
FROM (
SELECT productid xx, @a yy FROM products
UNION ALL
SELECT productid xx, unitsinstock yy FROM products
) zz
GROUP BY yy
Note This query is not a reproduce scenario for the Northwind database. It is only there to show the form and syntax of a hypothetical query on a hypothetical table named products.
RESOLUTION
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
290211 How to obtain the latest SQL Server 2000 service pack
Hotfix information
The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name
---------------------------------------------------------------------------
31-May-2003 18:45 2000.80.818.0 78,400 bytes Console.exe
25-Jun-2003 01:01 2000.80.818.0 33,340 bytes Dbmslpcn.dll
25-Apr-2003 02:12 786,432 bytes Distmdl.ldf
25-Apr-2003 02:12 2,359,296 bytes Distmdl.mdf
30-Jan-2003 01:55 180 bytes Drop_repl_hotfix.sql
23-Jun-2003 22:40 2000.80.837.0 1,557,052 bytes Dtsui.dll
23-Jun-2003 22:40 2000.80.837.0 639,552 bytes Dtswiz.dll
24-Apr-2003 02:51 747,927 bytes Instdist.sql
03-May-2003 01:56 1,581 bytes Inst_repl_hotfix.sql
08-Feb-2003 06:40 2000.80.765.0 90,692 bytes Msgprox.dll
01-Apr-2003 02:07 1,873 bytes Odsole.sql
05-Apr-2003 01:46 2000.80.800.0 62,024 bytes Odsole70.dll
07-May-2003 20:41 2000.80.819.0 25,144 bytes Opends60.dll
02-Apr-2003 21:48 2000.80.796.0 57,904 bytes Osql.exe
02-Apr-2003 23:15 2000.80.797.0 279,104 bytes Pfutil80.dll
22-May-2003 22:57 19,195 bytes Qfe469571.sql
12-Jun-2003 16:37 1,083,989 bytes Replmerg.sql
04-Apr-2003 21:53 2000.80.798.0 221,768 bytes Replprov.dll
08-Feb-2003 06:40 2000.80.765.0 307,784 bytes Replrec.dll
05-May-2003 00:05 1,085,874 bytes Replsys.sql
01-Jun-2003 01:01 2000.80.818.0 492,096 bytes Semobj.dll
31-May-2003 18:27 2000.80.818.0 172,032 bytes Semobj.rll
29-May-2003 00:29 115,944 bytes Sp3_serv_uni.sql
01-Jun-2003 01:01 2000.80.818.0 4,215,360 bytes Sqldmo.dll
07-Apr-2003 17:44 25,172 bytes Sqldumper.exe
19-Mar-2003 18:20 2000.80.789.0 28,672 bytes Sqlevn70.rll
02-Jul-2003 00:18 2000.80.834.0 180,736 bytes Sqlmap70.dll
08-Feb-2003 06:40 2000.80.765.0 57,920 bytes Sqlrepss.dll
23-Jun-2003 22:40 2000.80.837.0 7,553,105 bytes Sqlservr.exe
08-Feb-2003 06:40 2000.80.765.0 45,644 bytes Sqlvdi.dll
25-Jun-2003 01:01 2000.80.818.0 33,340 bytes Ssmslpcn.dll
01-Jun-2003 01:01 2000.80.818.0 82,492 bytes Ssnetlib.dll
01-Jun-2003 01:01 2000.80.818.0 25,148 bytes Ssnmpn70.dll
01-Jun-2003 01:01 2000.80.818.0 158,240 bytes Svrnetcn.dll
31-May-2003 18:59 2000.80.818.0 76,416 bytes Svrnetcn.exe
30-Apr-2003 23:52 2000.80.816.0 45,132 bytes Ums.dll
02-Jul-2003 00:19 2000.80.834.0 98,816 bytes Xpweb70.dll
Note Because of file dependencies, the most recent hotfix or feature that contains the files may also contain additional files.
WORKAROUND
One of the requirements to result in this incorrect results scenario is that the query picks a parallel plan. To work around this problem, you can disable parallelism either at the query level by using a "MAXDOP 1" hint (see SQL Server Books Online for more information), or at a server level by setting the configuration parameter "Max Degree of Parallelism" to 1 (by using the sp_configure stored procedure).
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.
Keywords: kbbug kbfix kbqfe kbsqlserv2000presp4fix kbhotfixserver KB822746
