Microsoft KB Archive/281338

= FIX: Select Distinct Fails to Eliminate Duplicate Null Values on Bit Datatype =

Article ID: 281338

Article Last Modified on 3/14/2006

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APPLIES TO


 * Microsoft SQL Server 7.0 Standard Edition

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This article was previously published under Q281338



BUG #: 26147 (SQLBUG_70)



SYMPTOMS
Select distinct does not eliminate duplicate null values that are contained in bit datatype columns.



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.



MORE INFORMATION
Use the code that follows to reproduce this behavior: create table #myTable( bar bit) go insert into #mytable values (1) insert into #mytable values (1) insert into #mytable values (NULL) insert into #mytable values (NULL) go select distinct bar from #mytable go The preceding code returns this result: bar NULL NULL 1 Note that the code correctly eliminates the duplicate value 1 but incorrectly returns duplicate null values. The correct resultset is: bar NULL 1

Keywords: kbbug kbfix KB281338

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