Using the Round function in Sybase 12.5

If I have the following table:

 ID(integer)   Cost(float)
  2                1.1499999999999999

and then run the following update:

update Table  
            set Cost = round((Cost + 1),2)  
where  ID=2

the result is:

 ID(integer)   Cost(float)
  2                2.1499999999999999

Why isn't Round rounding and what do I achieve the desired affect (where Cost is rounded to 2.15)?


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Well, it is. The "problem" is this: the base-10 real number 2.15 (and many others) has no exact representation in the floating-point scheme used by Sybase for type float (because it's not base-10, it's base 2 or 16 -- can't remember which). 2.14999999999999 is as good as it gets. Should this worry you? Probably not. Unless you are really concered with precision down to like the 15th position you can safely use floats -- but people will be confused if they are viewing them with many decimal digits.


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