From: | tania gutierrez <tanitamile(at)yahoo(dot)com> |
---|---|
To: | pgsql-es-ayuda(at)postgresql(dot)org |
Subject: | Ya existe el manejo de Assertions en postreSQL 7.4 o version superior? |
Date: | 2006-01-31 02:11:02 |
Message-ID: | 20060131021102.20595.qmail@web52915.mail.yahoo.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-es-ayuda |
Saludos listeros,
Quisiera saber si Ya existe el manejo de Assertions en postreSQL 7.4 o version superior?
lei en esta pagina que todavia no, pero si tienen informacion les agradezco:
http://www.redhat.com/docs/manuals/database/RHDB-7.1.3-Manual/sql/sql-createtable.html
CONSTRAINT clause SQL92 specifies some additional capabilities for constraints, and also defines assertions and domain constraints.
An assertion is a special type of integrity constraint and shares the same namespace as other constraints. However, an assertion is not necessarily dependent on one particular table as constraints are, so SQL-92 provides the CREATE ASSERTION statement as an alternate method for defining a constraint:
CREATE ASSERTION name CHECK ( condition )
Gracias:
Tania
__________________________________________________
Correo Yahoo!
Espacio para todos tus mensajes, antivirus y antispam ¡gratis!
Regístrate ya - http://correo.espanol.yahoo.com/
From | Date | Subject | |
---|---|---|---|
Next Message | Jaime Casanova | 2006-01-31 03:32:47 | Re: Ya existe el manejo de Assertions en postreSQL 7.4 o version superior? |
Previous Message | Carlos Chavez Herrera | 2006-01-31 01:06:00 | Re: saludos |