On Sun, Oct 10, 2010 at 5:16 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> It was pointed out upthread that while median isn't presently
> in the standard, Oracle defines it in terms of percentile_cont(0.5)
> which *is* in the standard. What I read in SQL:2008 is that
> percentile_cont is defined for all numeric types (returning
> approximate numeric with implementation-defined precision),
> and for interval (returning interval), and not for any other
> input type. So it appears to me that what we ought to support
> is
> median(float8) returns float8
> median(interval) returns interval
> and nothing else --- we can rely on implicit casting to convert
> any other numeric input type to float8.
Isn't there a possibility of a precision loss if numeric gets cast to
float8? Should we include an explicit variant from numeric?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company