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

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This article was previously published under Q281338

BUG #: 26147 (SQLBUG_70)

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SYMPTOMS

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

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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 (http://support.microsoft.com/kb/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.

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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: