Re: Using constraint exclusion with 2 floats - Mailing list pgsql-general

From Julien Rouhaud
Subject Re: Using constraint exclusion with 2 floats
Date
Msg-id CAOBaU_biKOY6LQKwz88TM=r1d540zNUE78k7JFHjYAHu5rqvTA@mail.gmail.com
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In response to Re: Using constraint exclusion with 2 floats  (Simon Riggs <simon@2ndQuadrant.com>)
Responses Re: Using constraint exclusion with 2 floats  (Simon Riggs <simon@2ndQuadrant.com>)
List pgsql-general
Thank you for your answer.

I'm sorry I really didn't explained well my problem :/

For example if I have a table test like this :
CREATE TABLE test (min real not null, max real not null, desc character varying not null);

and I want a constraint exclusion to make sure the range min/max doens't overlap

I can't write ALTER TABLE test add constraint test_exclude EXCLUDE USING btree ((min,max) WITH &&)

I saw the extension temporal gives a new type PERIOD and has operators like &&, but only for timestamp, so I'm wondering if I must code something something similar or if there's is an easier way



On Wed, Oct 12, 2011 at 11:23 PM, Simon Riggs <simon@2ndquadrant.com> wrote:
On Wed, Oct 12, 2011 at 10:16 AM, Julien Rouhaud <rjuju123@gmail.com> wrote:
> Hi everyone,
> Is there an easy way (that I maybe missed) to use constraint exclusion with
> 2 floats ?
> Must I find an extension the temporal extension which create a new type with
> 2 timestamp or can I usethe && operator with 2 fields ?

There's nothing in constraint exclusion that depends upon specific datatypes.

Let us know if you find a problem with floats.

--
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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