Tasneem,

> For example: For 6,
> the range defined by NEAR is:                               4 – 8 For
> 2147,483,647, the range defined by NEAR is:           1717,986,917 –
> 2576,980,377 But yes, for other cases it may not give good results. We can
> give the option for the user to specify the membership degree, or one can
> always use the BETWEEN operator when he knows the thresholds exactly.

Oh, so this is actually based on a direct calculation on the values, rather 
than on the population of data.  That's much easier; heck, you could index on 
it.

-- 
Josh Berkus
PostgreSQL @ Sun
San Francisco

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