Henry Drexler <alonup...@gmail.com> writes:
> [ "1/3" yields zero ]

Yeah, it's an integer division.

> I thought perhaps I could cast it as double precision as noted on
> http://www.postgresql.org/docs/8.3/interactive/sql-expressions.html
> though doing the following:
> float8(1/3)

That's casting the result of the division to float, which is way too
late.  You need to cast one or both inputs to non-integer, for instance

        1.0/3
        1/(3::float8)

etc etc.

                        regards, tom lane

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