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Are all rounds created equal


Are all rounds created equal

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Daniel Bowlin
Daniel Bowlin
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Interesting question. I thought all Microsoft software did banker's rounding. Thanks.
Oleg Netchaev
Oleg Netchaev
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Daniel Bowlin (10/13/2010)
Interesting question. I thought all Microsoft software did banker's rounding. Thanks.

It is flexible. CLR procedures in SQL Server, any .NET code can use one of the two MidpointRounding enum values as a mode parameter value of the of the Math.Round method:

Math.Round(4.5, 0, MidpointRounding.AwayFromZero); -- 5
Math.Round(4.5, 0, MidpointRounding.ToEven); -- 4

Oleg
timothy bates
timothy bates
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Thanks for the comments.

In a view SQL Server returned n.n where in query analyzer it returned n.n0 for each.

My main point was to showcase that there is disparity in programs as to how rounding is performed. Logic or specifications taken at face value (Round the average tax to the nearest tenth) can create differences in results. If you have an application performing the rounding and storing it in the db and run a periodic db script to verify you may get answers that result in 'random' discrepancies.

Tim

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UMG Developer
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Thanks for the question.

As a note I have always hated the round "to even" method that Microsoft sometimes uses.
SQLRNNR
SQLRNNR
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Thanks for the QOTD

Jason...AKA CirqueDeSQLeil
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Dhruvesh Shah
Dhruvesh Shah
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Awesome Question...
sharath.chalamgari
sharath.chalamgari
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Thanks! it really helped me to understand clearly
SQL-DBA-01
SQL-DBA-01
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Nice one. I hope 2.50 and 2.5 or 3.60 and 3.6 are taken as same!

Thanks.
kalyani.k478
kalyani.k478
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