<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.27 2001/09/07 21:57:53 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.28 2001/09/12 02:13:25 ishii Exp $
Postgres documentation
-->
<para>
To add a check constraint to a table:
<programlisting>
-ALTER TABLE distributors ADD CONSTRAINT zipchk CHECK (char_length(zipcode) = 5)
+ALTER TABLE distributors ADD CONSTRAINT zipchk CHECK (char_length(zipcode) = 5);
</programlisting>
</para>
<para>
To remove a check constraint from a table and all its children:
<programlisting>
-ALTER TABLE distributors DROP CONSTRAINT zipchk
+ALTER TABLE distributors DROP CONSTRAINT zipchk;
</programlisting>
</para>
<para>
To add a foreign key constraint to a table:
<programlisting>
-ALTER TABLE distributors ADD CONSTRAINT distfk FOREIGN KEY (address) REFERENCES addresses(address) MATCH FULL
+ALTER TABLE distributors ADD CONSTRAINT distfk FOREIGN KEY (address) REFERENCES addresses(address) MATCH FULL;
</programlisting>
</para>
<para>
To add a (multi-column) unique constraint to a table:
<programlisting>
-ALTER TABLE distributors ADD CONSTRAINT dist_id_zipcode_key UNIQUE (dist_id, zipcode)
+ALTER TABLE distributors ADD CONSTRAINT dist_id_zipcode_key UNIQUE (dist_id, zipcode);
</programlisting>
</para>
</refsect1>