<!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/create_domain.sgml,v 1.17 2003/11/29 19:51:38 pgsql Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/create_domain.sgml,v 1.18 2004/08/08 01:49:30 momjian Exp $
PostgreSQL documentation
-->
<title>Examples</title>
<para>
- This example creates the <type>country_code</type> data type and then uses the
- type in a table definition:
+ This example creates the <type>us_postal_code</type> data type and
+ then uses the type in a table definition:
+
<programlisting>
-CREATE DOMAIN country_code char(2) NOT NULL;
-CREATE TABLE countrylist (id integer, country country_code);
+CREATE DOMAIN us_postal_code AS TEXT
+NOT NULL
+CHECK(
+ VALUE ~ $pc$^\d{5}$$pc$
+OR VALUE ~ $pc$^\d{5}-\d{4}$$pc$
+);
+
+CREATE TABLE us_snail_addy (
+ address_id SERIAL NOT NULL PRIMARY KEY
+, street1 TEXT NOT NULL
+, street2 TEXT
+, street3 TEXT
+, city TEXT NOT NULL
+, postal us_postal_code
+);
</programlisting>
</para>
</refsect1>