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diff --git a/doc/src/sgml/ref/alter_view.sgml b/doc/src/sgml/ref/alter_view.sgml new file mode 100644 index 0000000..e8d9e11 --- /dev/null +++ b/doc/src/sgml/ref/alter_view.sgml @@ -0,0 +1,219 @@ +<!-- +doc/src/sgml/ref/alter_view.sgml +PostgreSQL documentation +--> + +<refentry id="sql-alterview"> + <indexterm zone="sql-alterview"> + <primary>ALTER VIEW</primary> + </indexterm> + + <refmeta> + <refentrytitle>ALTER VIEW</refentrytitle> + <manvolnum>7</manvolnum> + <refmiscinfo>SQL - Language Statements</refmiscinfo> + </refmeta> + + <refnamediv> + <refname>ALTER VIEW</refname> + <refpurpose>change the definition of a view</refpurpose> + </refnamediv> + + <refsynopsisdiv> +<synopsis> +ALTER VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable> ALTER [ COLUMN ] <replaceable class="parameter">column_name</replaceable> SET DEFAULT <replaceable class="parameter">expression</replaceable> +ALTER VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable> ALTER [ COLUMN ] <replaceable class="parameter">column_name</replaceable> DROP DEFAULT +ALTER VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable> OWNER TO { <replaceable class="parameter">new_owner</replaceable> | CURRENT_USER | SESSION_USER } +ALTER VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable> RENAME [ COLUMN ] <replaceable class="parameter">column_name</replaceable> TO <replaceable class="parameter">new_column_name</replaceable> +ALTER VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable> RENAME TO <replaceable class="parameter">new_name</replaceable> +ALTER VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable> SET SCHEMA <replaceable class="parameter">new_schema</replaceable> +ALTER VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable> SET ( <replaceable class="parameter">view_option_name</replaceable> [= <replaceable class="parameter">view_option_value</replaceable>] [, ... ] ) +ALTER VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable> RESET ( <replaceable class="parameter">view_option_name</replaceable> [, ... ] ) +</synopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para> + <command>ALTER VIEW</command> changes various auxiliary properties + of a view. (If you want to modify the view's defining query, + use <command>CREATE OR REPLACE VIEW</command>.) + </para> + + <para> + You must own the view to use <command>ALTER VIEW</command>. + To change a view's schema, you must also have <literal>CREATE</literal> + privilege on the new schema. + To alter the owner, you must also be a direct or indirect member of the new + owning role, and that role must have <literal>CREATE</literal> privilege on + the view's schema. (These restrictions enforce that altering the owner + doesn't do anything you couldn't do by dropping and recreating the view. + However, a superuser can alter ownership of any view anyway.) + </para> + </refsect1> + + <refsect1> + <title>Parameters</title> + + <variablelist> + <varlistentry> + <term><replaceable class="parameter">name</replaceable></term> + <listitem> + <para> + The name (optionally schema-qualified) of an existing view. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term><replaceable class="parameter">column_name</replaceable></term> + <listitem> + <para> + Name of an existing column. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term><replaceable class="parameter">new_column_name</replaceable></term> + <listitem> + <para> + New name for an existing column. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term><literal>IF EXISTS</literal></term> + <listitem> + <para> + Do not throw an error if the view does not exist. A notice is issued + in this case. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term><literal>SET</literal>/<literal>DROP DEFAULT</literal></term> + <listitem> + <para> + These forms set or remove the default value for a column. + A view column's default value is substituted into any + <command>INSERT</command> or <command>UPDATE</command> command whose target is the + view, before applying any rules or triggers for the view. The view's + default will therefore take precedence over any default values from + underlying relations. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term><replaceable class="parameter">new_owner</replaceable></term> + <listitem> + <para> + The user name of the new owner of the view. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term><replaceable class="parameter">new_name</replaceable></term> + <listitem> + <para> + The new name for the view. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term><replaceable class="parameter">new_schema</replaceable></term> + <listitem> + <para> + The new schema for the view. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term><literal>SET ( <replaceable class="parameter">view_option_name</replaceable> [= <replaceable class="parameter">view_option_value</replaceable>] [, ... ] )</literal></term> + <term><literal>RESET ( <replaceable class="parameter">view_option_name</replaceable> [, ... ] )</literal></term> + <listitem> + <para> + Sets or resets a view option. Currently supported options are: + <variablelist> + <varlistentry> + <term><literal>check_option</literal> (<type>enum</type>)</term> + <listitem> + <para> + Changes the check option of the view. The value must + be <literal>local</literal> or <literal>cascaded</literal>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><literal>security_barrier</literal> (<type>boolean</type>)</term> + <listitem> + <para> + Changes the security-barrier property of the view. The value must + be Boolean value, such as <literal>true</literal> + or <literal>false</literal>. + </para> + </listitem> + </varlistentry> + </variablelist></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Notes</title> + + <para> + For historical reasons, <command>ALTER TABLE</command> can be used with + views too; but the only variants of <command>ALTER TABLE</command> + that are allowed with views are equivalent to the ones shown above. + </para> + </refsect1> + + <refsect1> + <title>Examples</title> + + <para> + To rename the view <literal>foo</literal> to + <literal>bar</literal>: +<programlisting> +ALTER VIEW foo RENAME TO bar; +</programlisting> + </para> + + <para> + To attach a default column value to an updatable view: +<programlisting> +CREATE TABLE base_table (id int, ts timestamptz); +CREATE VIEW a_view AS SELECT * FROM base_table; +ALTER VIEW a_view ALTER COLUMN ts SET DEFAULT now(); +INSERT INTO base_table(id) VALUES(1); -- ts will receive a NULL +INSERT INTO a_view(id) VALUES(2); -- ts will receive the current time +</programlisting></para> + </refsect1> + + <refsect1> + <title>Compatibility</title> + + <para> + <command>ALTER VIEW</command> is a <productname>PostgreSQL</productname> + extension of the SQL standard. + </para> + </refsect1> + + <refsect1> + <title>See Also</title> + + <simplelist type="inline"> + <member><xref linkend="sql-createview"/></member> + <member><xref linkend="sql-dropview"/></member> + </simplelist> + </refsect1> +</refentry> |