BUG: "IF UPDATE" Functionality Does Not Work in SQL Server 6.5 Service Pack 5 and 5a

ID: Q216700

The information in this article applies to:
BUG #: 18578 (SQLBUG_65)

SYMPTOMS

Within a trigger on SQL Server 6.5 Service Pack 5 or 5a, the IF UPDATE clause will evaluate to true for all columns when an INSERT is performed, even if there is no value specified and no default value exists for the column. The expected behavior is detailed in the SQL Server 6.5 Books Online as follows:

Implicit and Explicit Null Values (SQL 6.5):

The IF UPDATE (column_name) clause is true for an INSERT statement whenever the column is assigned a value in the select list or in the VALUES clause. An explicit NULL or a default assigns a value to a column and thus activates the trigger. With an implicit NULL, if the value is not specified by the query or by the assigned default, the trigger on that column is not activated.


RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next SQL Server service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp



   Date       Time    Version      Size        File name      Platform
   -------------------------------------------------------------------

   01/29/99   2:04:05 1999.01.99   2,555,152   Sqlservr.exe   x86
   01/29/99   1:10:06 1999.01.29     151,312   Opends60.dll   x86

   01/29/99   2:02:10 1999.01.29   4,047,120   Sqlservr.exe   Alpha
   01/29/99   1:10:13 1999.01.99     159,504   Opends60.dll   Alpha


NOTE: Due to file dependencies, the most recent hotfix or feature that contains the above files may also contain additional files.



NOTE: If this product was already installed on your computer when you purchased it from the Original Equipment Manufacturer (OEM) and you need this fix, please call the Pay Per Incident number listed on the above Web site. If you contact Microsoft to obtain this fix, and if it is determined that you only require the fix you requested, no fee will be charged. However, if you request additional technical support, and if your no-charge technical support period has expired, or if you are not eligible for standard no-charge technical support, you may be charged a non-refundable fee.

For more information about eligibility for no-charge technical support, see the following article in the Microsoft Knowledge Base:
Q154871 Determining If You Are Eligible for No-Charge Technical Support


STATUS

Microsoft has confirmed this to be a problem in SQL Server version 6.5 Service Pack 5 and 5a.


MORE INFORMATION

Additional query words: incorrect results sp5 sp 


Keywords          : kbbug6.50 
Version           : winnt:6.5 Service Pack 5 and 5a
Platform          : winnt 
Issue type        : kbbug

Last Reviewed: July 2, 1999