Tom Lane wrote:
There is special-purpose software out there that can compute exactly
with rational numbers, but you aren't likely to find it embedded in any
general-purpose tools like databases --- the use-case just isn't wide
enough. One reason why not is that it'll still fall down on irrational
numbers.
<nit>
1/3 is a rational number. however, it is a repeating fraction when
expressed in decimal.
</nit>
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