FIX: Dividing 0 by a Negative Decimal or Numeric Number Results in -0

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Article ID: 285544 - View products that this article applies to.
This article was previously published under Q285544
BUG #: 203148 (SHILOH_bugs)
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When using decimal or numeric data types, if you divide 0 by a negative number, a negative 0 (-0) is returned.


To resolve this problem, obtain the latest service pack for SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
290211 INF: How to Obtain the Latest SQL Server 2000 Service Pack


Check for 0 before you perform the division and avoid the division if 0 is involved; for example:
declare @v1 dec(10, 2), @v2 dec(2, 1), @v3 dec (10,2) 
-- @v3 is the result of @v1/@v2
select @v1 = 0.0, @v2 = -1.0
if @v1 = 0  
   select @v3 = 0.0
   select @v3 = @v1 / @v2


Microsoft has confirmed that this is a problem in SQL Server 2000. This problem was first corrected in SQL Server 2000 Service Pack 1.


SQL Server does not consider the computed value (-0) equal to 0, so the comparison of the computed value (-0) with 0 fails. For example, the following code
   declare @v1 dec(10, 2), @v2 dec(2, 1)
   select @v1 = 0.0, @v2 = -1.0
   if @v1 / @v2 = 0  
      print 'equals zero'
      print 'not equal zero'
Gives the following result:
   not equal zero 
For additional information about related bugs in SQL Server 7.0, click the article number below to view the article in the Microsoft Knowledge Base:
275608 FIX: Mathematical Operations on Numeric or Decimal Columns with Negative Numbers May Return Unexpected Results


Article ID: 285544 - Last Review: October 16, 2003 - Revision: 3.2
  • Microsoft SQL Server 2000 Standard Edition
kbbug kbfix kbsqlserv2000sp1fix KB285544

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