Microsoft KB Archive/888998

= FIX: A query that joins two tables on smalldatetime data type columns, may produce incorrect results in SQL Server 2000 =

Article ID: 888998

Article Last Modified on 11/2/2007

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APPLIES TO


 * Microsoft SQL Server 2000 Desktop Engine
 * Microsoft SQL Server 2000 Service Pack 3
 * Microsoft SQL Server 2000 Personal Edition Service Pack 3
 * Microsoft SQL Server 2000 Service Pack 3
 * Microsoft SQL Server 2000 Service Pack 3

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Bug #: 473085 (SQL Server 8.0)



Article contents
 Summary Symptoms Cause Resolution 

Hotfix information

 

Prerequisites

 

Restart information

</li> 

Hotfix file information

</li> Workaround</li> Status</li> More Information</li></ul>

<div class="summary_section">

SUMMARY
This article describes the following about this hotfix release:
 * The issues that are fixed by this hotfix package
 * The prerequisites for installing the hotfix package
 * Whether you must restart your computer after you install the hotfix package
 * Whether the hotfix package is replaced by any other hotfix package
 * Whether you must make any registry changes
 * The files that are contained in the hotfix package

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<div class="symptoms_section">

SYMPTOMS
In Microsoft SQL Server 2000 with hotfix build 8.00.0837 or a later version, you may run a query that joins two tables by using an equijoin on a smalldatetime data type column. An equijoin is a join where rows from two tables are combined and added to the result set when there are equal values in the joined columns. If a filter condition with a literal is on one of these columns, the query may return incorrect results. The following query is an example of an affected query: declare @Date datetime set @Date = '2005-01-01'

Select t1.c1, t2.c2 from t1 Join t2 on t1.smalldatetime_column = t2.smalldatetime_column Where t1.smalldatetime_column = @Date For a list of all publicly released SQL Server 2000 Post-Service Pack 3a hotfixes, see the following article in the Microsoft Knowledge Base:

810185 SQL Server 2000 hotfix update for SQL Server 2000 Service Pack 3 and 3a

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<div class="cause_section">

CAUSE
This problem occurs because the SQL Server 2000 hotfix build 8.00.0837 optimizes queries to include an implied predicate value whenever possible. Because the implied parameter incorrectly uses a 4-byte smalldatetime constant instead of the 8 byte datetime constant, incorrect evaluation of the comparison occurs at run time.

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<div class="resolution_section">

Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next SQL Server 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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Prerequisites
You must install SQL Server 2000 Service Pack 3. For more informationabout how to obtain SQL Server 2000 Service Pack 3, 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

Additionally, this hotfix requires that you also have SQL Server 2000 hotfix build 2000.80.977 installed. For more information about SQL Server 2000 Post SP3a hotfix build 2000.80.977, click the following article number to view the article in the Microsoft Knowledge Base:

888007 You receive a &quot;The product does not have a prerequisite update installed&quot; error message when you try to install a SQL Server 2000 post-Service Pack 3 hotfix

Restart information
You have to restart your SQL Server service after you apply this hotfix.

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Hotfix file information
This hotfix contains only those files that are required to correct the issues that this article lists. This hotfix may not contain all the files that you must have to fully update a product to the latest build.

The English version of this hotfix has the file attributes (or later file attributes) 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. <pre class="fixed_text">  Date         Time   Version        Size       File name --  02-Nov-2004  06:02  2000.80.985.0    664,128  Autoplt.dll 02-Nov-2004 06:02  2000.80.985.0     78,400  Console.exe 02-Nov-2004 06:02  2000.80.985.0    332,352  Ctasksui.dll 02-Nov-2004 06:02  2000.80.985.0    315,968  Custtask.dll 02-Nov-2004 06:02  2000.80.985.0     33,340  Dbmslpcn.dll 02-Nov-2004 06:02  2000.80.985.0  1,905,216  Dtspkg.dll 02-Nov-2004 06:02  2000.80.985.0    528,960  Dtspump.dll 02-Nov-2004 06:02  2000.80.985.0     41,536  Dtsrun.exe 02-Nov-2004 06:02  2000.80.985.0  1,557,052  Dtsui.dll 02-Nov-2004 06:02  2000.80.985.0    639,552  Dtswiz.dll 02-Nov-2004 06:02  2000.80.985.0    352,828  Isqlw.exe 02-Nov-2004 06:02  2000.80.985.0     82,492  Itwiz.exe 02-Nov-2004 06:02  2000.80.985.0     90,692  Msgprox.dll 19-May-2004 23:43  8.11.40209.0     209,408  Mssdi98.dll 02-Nov-2004 06:02  2000.80.985.0     62,024  Odsole70.dll 02-Nov-2004 06:03  2000.80.985.0     25,144  Opends60.dll 02-Nov-2004 05:35                    17,576  Opends60.lib 02-Nov-2004 06:02  2000.80.985.0     57,904  Osql.exe 02-Nov-2004 06:02  2000.80.985.0    279,104  Pfutil80.dll 02-Nov-2004 06:02  2000.80.985.0    143,940  Qrdrsvc.exe 02-Nov-2004 06:02  2000.80.985.0    221,768  Replprov.dll 02-Nov-2004 06:03  2000.80.985.0    307,784  Replrec.dll 02-Nov-2004 06:03  2000.80.985.0    287,304  Rinitcom.dll 02-Nov-2004 06:03  2000.80.985.0     78,416  Sdiclnt.dll 02-Nov-2004 06:03  2000.80.985.0     66,112  Semmap.dll 02-Nov-2004 06:03  2000.80.985.0     57,916  Semnt.dll 02-Nov-2004 06:03  2000.80.985.0    492,096  Semobj.dll 02-Nov-2004 06:02  2000.80.985.0     53,832  Snapshot.exe 02-Nov-2004 06:01  2000.80.985.0     28,672  Sqlagent.dll 02-Nov-2004 06:02  2000.80.985.0    311,872  Sqlagent.exe 02-Nov-2004 06:01  2000.80.985.0    168,001  Sqlakw32.dll 02-Nov-2004 05:05                     4,352  Sqlakw32.lib 02-Nov-2004 06:03  2000.80.985.0     33,344  Sqlctr80.dll 02-Nov-2004 06:03  2000.80.985.0    815,676  Sqldata.dll 02-Nov-2004 06:03  2000.80.985.0  4,215,360  Sqldmo.dll 02-Nov-2004 06:02                    25,172  Sqldumper.exe 02-Nov-2004 06:02  2000.80.985.0    156,224  Sqlmaint.exe 02-Nov-2004 06:03  2000.80.985.0    180,792  Sqlmap70.dll 02-Nov-2004 06:03  2000.80.985.0    188,992  Sqlmmc.dll 02-Nov-2004 06:03  2000.80.985.0    401,984  Sqlqry.dll 02-Nov-2004 06:03  2000.80.985.0     57,920  Sqlrepss.dll 02-Nov-2004 06:03  2000.80.985.0  7,712,849  Sqlservr.exe 02-Nov-2004 06:03  2000.80.985.0    590,396  Sqlsort.dll 02-Nov-2004 06:03  2000.80.985.0     45,644  Sqlvdi.dll 02-Nov-2004 06:03  2000.80.985.0    106,588  Sqsrvres.dll 02-Nov-2004 06:03  2000.80.985.0     33,340  Ssmsgnet.dll 02-Nov-2004 06:03  2000.80.985.0     33,340  Ssmslpcn.dll 02-Nov-2004 06:03  2000.80.985.0     33,340  Ssmsqlgc.dll 02-Nov-2004 06:03  2000.80.985.0     33,340  Ssmssnet.dll 02-Nov-2004 06:03  2000.80.985.0     82,492  Ssnetlib.dll 02-Nov-2004 06:03  2000.80.985.0     25,148  Ssnmpn70.dll 02-Nov-2004 06:03  2000.80.985.0    123,456  Stardds.dll 02-Nov-2004 06:03  2000.80.985.0    158,240  Svrnetcn.dll 02-Nov-2004 06:02  2000.80.985.0     76,416  Svrnetcn.exe 02-Nov-2004 06:03  2000.80.985.0     49,228  Ums.dll 02-Nov-2004 06:03  2000.80.985.0     74,304  Xplog70.dll 02-Nov-2004 06:03  2000.80.985.0     98,872  Xpweb70.dll 17-Nov-2004 18:13                     6,615  Hotfix1.inf 17-Nov-2004 18:13                     2,471  Hotfix2.inf 30-Sep-2003 22:34  8.0.21213.0      352,256  Msvcr71.dll 30-Sep-2003 22:34  2000.80.796.0     57,904  Osql.exe 30-Sep-2003 22:34  2000.80.534.0    127,548  Sqdedev.dll 30-Sep-2003 22:34  2000.80.194.0    180,290  Sqlunirl.dll 02-Nov-2004 05:01  2000.80.985.0    159,813  Replres.rll 02-Nov-2004 05:28  2000.80.985.0    172,032  Semobj.rll 02-Nov-2004 04:53  2000.80.985.0     28,672  Sqlevn70.rll 02-Nov-2004 05:17  2000.80.985.0    479,232  Sqlmmc.rll Note Because of file dependencies, the most recent hotfix that contains these files may also contain additional files.back to the top

<div class="workaround_section">

WORKAROUND
To work around this issue, use one of the following methods:
 * Use the cast function to cast the datetime column as a smalldate constant.
 * Create a non-clustered index on the smalldatetime column.

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<div class="status_section">

STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the &quot;Applies to&quot; section.

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<div class="moreinformation_section">

Steps to reproduce the behavior
The following Transact-SQL statements on SQL Server 2000 with hotfix build 8.00.0837 and later versions incorrectly return 0 rows: select @@version go Create Table t1 (     c1 SmallDateTime,      c2 varchar(15) ) go Create Table t2 (     c1 smalldatetime,      c2 Varchar(15) ) go Insert Into t1 Values ('2004-10-21','abc') Insert Into t1 Values ('2004-10-21','efg') Insert Into t2 Values ('2004-10-21', 'ddd') Insert Into t2 Values ('2004-10-21', 'eee') declare @Date datetime set @Date = '2004-10-21' Select t1.*, t2.* from t1 join t2 On t1.c1 = t2.c1 Where t1.c1 = @Date go drop table t1 drop table t2 go The correct results are the following four rows. These rows are obtained on a computer that is running SQL Server 2000 with hotfix build 8.00.0760, .0818, and builds through build .0836. c1                                                    c2              c1                                                     c2              -- --- -- --- 2004-10-21 00:00:00                                   abc             2004-10-21 00:00:00                                    ddd 2004-10-21 00:00:00                                   abc             2004-10-21 00:00:00                                    eee 2004-10-21 00:00:00                                   efg             2004-10-21 00:00:00                                    ddd 2004-10-21 00:00:00                                   efg             2004-10-21 00:00:00                                    eee For more information about the naming schema for SQL Server updates, click the following article number to view the article in the Microsoft Knowledge Base:

822499 New naming schema for Microsoft SQL Server software update packages

For more information about the terminology that Microsoft uses when it corrects software after it is released, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

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Keywords: kbsqlserv2000presp4fix kbbug kbfix kbhotfixserver kbqfe KB888998

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