Re: Postgres 9.2.4 "Double Precision" Precision

On 09/14/2013 08:51 AM, Kevin Grittner wrote:

Adrian Klaver <adrian.klaver@gmail.com> wrote:

create table float_test (id int, f_fld double precision);
insert into  float_test values (1, 6.31);
insert into  float_test values (2, 6.32);
select * from float_test ;

    id | f_fld
----+-------
    1 |  6.31
    2 |  6.32
(2 rows)

If, instead of those inserts I use these:

insert into  float_test values (1, '6.31');
insert into  float_test values (1, '6.32');
insert into  float_test values (1, '6.32'::double precision);
insert into  float_test values (1, '6.32'::real);

I get:

  id |      f_fld
----+------------------
   1 |             6.31
   1 |             6.32
   1 |             6.32
   1 | 6.32000017166138
(4 rows)

Apparently the value is being treated as a real value somewhere.

Interesting, more grist for the mill.

--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

--

Adrian Klaver
adrian.klaver@gmail.com

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