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ALTER DOMAIN .. SET / DROP NOT NULL
ALTER DOMAIN .. SET / DROP DEFAULT ALTER DOMAIN .. ADD / DROP CONSTRAINT New files: - doc/src/sgml/ref/alter_domain.sgml Rod Taylor
This commit is contained in:
Bruce Momjian
@@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.49 2002/09/07 16:49:50 momjian Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.50 2002/12/06 03:28:27 momjian Exp $
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PostgreSQL documentation
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Complete list of usable sgml source files in this directory.
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-->
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@@ -38,6 +38,7 @@ Complete list of usable sgml source files in this directory.
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<!-- SQL commands -->
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<!entity abort system "abort.sgml">
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<!entity alterDatabase system "alter_database.sgml">
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<!entity alterDomain system "alter_domain.sgml">
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<!entity alterGroup system "alter_group.sgml">
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<!entity alterTable system "alter_table.sgml">
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<!entity alterTrigger system "alter_trigger.sgml">
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237
doc/src/sgml/ref/alter_domain.sgml
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237
doc/src/sgml/ref/alter_domain.sgml
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_domain.sgml,v 1.1 2002/12/06 03:28:27 momjian Exp $
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PostgreSQL documentation
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-->
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<refentry id="SQL-ALTERDOMAIN">
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<refmeta>
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<refentrytitle id="sql-alterdomain-title">ALTER DOMAIN</refentrytitle>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>
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ALTER DOMAIN
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</refname>
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<refpurpose>
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change the definition of a table
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</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<refsynopsisdivinfo>
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<date>2002-11-27</date>
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</refsynopsisdivinfo>
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<synopsis>
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ALTER DOMAIN <replaceable class="PARAMETER">domain</replaceable>
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{ SET DEFAULT <replaceable class="PARAMETER">value</replaceable> | DROP DEFAULT }
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ALTER DOMAIN <replaceable class="PARAMETER">domain</replaceable>
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{ SET | DROP } NOT NULL
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ALTER DOMAIN <replaceable class="PARAMETER">domain</replaceable>
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ADD <replaceable class="PARAMETER">domain_constraint</replaceable>
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ALTER DOMAIN <replaceable class="PARAMETER">domain</replaceable>
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DROP CONSTRAINT <replaceable class="PARAMETER">constraint_name</replaceable> [ RESTRICT | CASCADE ]
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</synopsis>
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<refsect2 id="R2-SQL-ALTERDOMAIN-1">
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<refsect2info>
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<date>2002-11-27</date>
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</refsect2info>
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<title>
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Inputs
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</title>
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<para>
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<variablelist>
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<varlistentry>
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<term><replaceable class="PARAMETER"> domain </replaceable></term>
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<listitem>
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<para>
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The name (possibly schema-qualified) of an existing domain to
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alter.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="PARAMETER"> domain_constraint </replaceable></term>
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<listitem>
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<para>
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New domain constraint for the domain.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="PARAMETER"> constraint_name </replaceable></term>
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<listitem>
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<para>
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Name of an existing constraint to drop.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>CASCADE</term>
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<listitem>
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<para>
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Automatically drop objects that depend constraint.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>RESTRICT</term>
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<listitem>
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<para>
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Refuse to drop the constraint if there are any dependent
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objects. This is the default behavior.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect2>
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<refsect2 id="R2-SQL-ALTERDOMAIN-2">
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<refsect2info>
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<date>1998-04-15</date>
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</refsect2info>
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<title>
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Outputs
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</title>
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<para>
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<variablelist>
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<varlistentry>
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<term><computeroutput>ALTER DOMAIN</computeroutput></term>
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<listitem>
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<para>
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Message returned from domain alteration.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><computeroutput>ERROR</computeroutput></term>
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<listitem>
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<para>
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Message returned if domain is not available.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect2>
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</refsynopsisdiv>
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<refsect1 id="R1-SQL-ALTERDOMAIN-1">
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<refsect1info>
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<date>2002-11-27</date>
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</refsect1info>
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<title>
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Description
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</title>
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<para>
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<command>ALTER DOMAIN</command> changes the definition of an existing domain.
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There are several sub-forms:
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</para>
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<variablelist>
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<varlistentry>
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<term>SET/DROP DEFAULT</term>
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<listitem>
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<para>
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These forms set or remove the default value for a column. Note
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that defaults only apply to subsequent <command>INSERT</command>
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commands; they do not cause rows already in a table using the domain.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>SET/DROP NOT NULL</term>
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<listitem>
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<para>
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These forms change whether a domain is marked to allow NULL
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values or to reject NULL values. You may only <literal>SET NOT NULL</>
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when the tables using the domain contain no null values in the domain
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based column.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>ADD <replaceable class="PARAMETER">domain_constraint</replaceable></term>
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<listitem>
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<para>
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This form adds a new constraint to a table using the same syntax as
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<xref linkend="SQL-CREATEDOMAIN" endterm="SQL-CREATEDOMAIN-TITLE">.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>DROP CONSTRAINT</term>
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<listitem>
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<para>
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This form drops constraints on a domain.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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You must own the domain to use <command>ALTER DOMAIN</>; except for
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<command>ALTER TABLE OWNER</>, which may only be executed by a superuser.
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</para>
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</refsect1>
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<refsect1 id="R1-SQL-ALTERDOMAIN-2">
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<title>
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Usage
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</title>
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<para>
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To add a NOT NULL constraint to a column:
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<programlisting>
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ALTER DOMAIN zipcode SET NOT NULL;
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</programlisting>
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To remove a NOT NULL constraint from a column:
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<programlisting>
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ALTER DOMAIN zipcode DROP NOT NULL;
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</programlisting>
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</para>
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<para>
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To add a check constraint to a table:
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<programlisting>
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ALTER DOMAIN zipcode ADD CONSTRAINT zipchk CHECK (char_length(VALUE) = 5);
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</programlisting>
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</para>
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<para>
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To remove a check constraint from a table and all its children:
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<programlisting>
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ALTER DOMAIN zipcode DROP CONSTRAINT zipchk;
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</programlisting>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:nil
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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sgml-parent-document:nil
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sgml-default-dtd-file:"../reference.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:"/usr/lib/sgml/catalog"
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sgml-local-ecat-files:nil
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End:
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-->
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@@ -1,5 +1,5 @@
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<!-- reference.sgml
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$Header: /cvsroot/pgsql/doc/src/sgml/reference.sgml,v 1.38 2002/09/08 02:33:08 momjian Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/reference.sgml,v 1.39 2002/12/06 03:28:27 momjian Exp $
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PostgreSQL Reference Manual
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-->
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||||
@@ -47,6 +47,7 @@ PostgreSQL Reference Manual
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&abort;
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&alterDatabase;
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&alterDomain;
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&alterGroup;
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&alterTable;
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&alterTrigger;
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