Обсуждение: Comparing Numeric and Double Precision (float8)..

Hello all,

i DON'T know what is the proper forum to throw this question and I must
to insist in this "feature".  Sorry.

I have a lot of tables from Oracle 8i Databases with a lot of columns
with numeric(x,0) definition.

Ok.. I am traslating my oracle tables to PostgreSQL tables.  But I am
having a serious problem with my client aplications.

When I compare a numeric(x,0) field with a float8 field I have an error
on PostgreSQL what I didn't have with Oracle.  I mean:

CREATE test (one numeric(2,0));

SELECT * FROM test WHERE one = 1.00000; 

This runs fine on my Oracle Systems.. but I have problems with my
PostgreSQL system.  I have tried to create an operator to workaround
this inconvenience:

numeric '=' float8    with CREATE OPERATOR command and calling to a function to return a
boolean.

Ok.. great.. It is running now.  But when it runs.. I have another
problems comparing numeric with integers and so on.  So I must to DROP
OPERATOR......

I don't understand what is the problem and what options I have to
workaround it (without re-write a lot of client applications).

I have a lot of code I don't want to modify.  The question is:

Why we cannot compare numeric with double precision ?  And why Oracle or
SQL can do it without problems ?

Thanks a lot.

On Mon, Nov 04, 2002 at 09:11:30 +0100, Terry Yapt <pgsql@technovell.com> wrote:
> 
> When I compare a numeric(x,0) field with a float8 field I have an error
> on PostgreSQL what I didn't have with Oracle.  I mean:
> 
> CREATE test (one numeric(2,0));
> 
> SELECT * FROM test WHERE one = 1.00000; 

With 7.3b3 the above works after correcting the create statement.
bruno=> create table test (one numeric(2,0));
CREATE TABLE
bruno=> SELECT * FROM test WHERE one = 1.00000;one
-----
(0 rows)

Great....

I don't know if my customers can wait until 7.3 official release, but
I'll try to distract them a bit... :-\

Thanks a lot Bruno... 

Bruno Wolff III wrote:
> 
> On Mon, Nov 04, 2002 at 09:11:30 +0100,
>   Terry Yapt <pgsql@technovell.com> wrote:
> >
> > When I compare a numeric(x,0) field with a float8 field I have an error
> > on PostgreSQL what I didn't have with Oracle.  I mean:
> >
> > CREATE test (one numeric(2,0));
> >
> > SELECT * FROM test WHERE one = 1.00000;
> 
> With 7.3b3 the above works after correcting the create statement.
> bruno=> create table test (one numeric(2,0));
> CREATE TABLE
> bruno=> SELECT * FROM test WHERE one = 1.00000;
>  one
> -----
> (0 rows)