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><H1
><A
NAME="SQL-ALTERVIEW"
></A
>ALTER VIEW</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN68150"
></A
><H2
>Name</H2
>ALTER VIEW -- change the definition of a view</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN68155"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER VIEW [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> ALTER [ COLUMN ] <TT
CLASS="REPLACEABLE"
><I
>column_name</I
></TT
> SET DEFAULT <TT
CLASS="REPLACEABLE"
><I
>expression</I
></TT
>
ALTER VIEW [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> ALTER [ COLUMN ] <TT
CLASS="REPLACEABLE"
><I
>column_name</I
></TT
> DROP DEFAULT
ALTER VIEW [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> OWNER TO <TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
>
ALTER VIEW [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> RENAME TO <TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
>
ALTER VIEW [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> SET SCHEMA <TT
CLASS="REPLACEABLE"
><I
>new_schema</I
></TT
>
ALTER VIEW [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> SET ( <TT
CLASS="REPLACEABLE"
><I
>view_option_name</I
></TT
> [= <TT
CLASS="REPLACEABLE"
><I
>view_option_value</I
></TT
>] [, ... ] )
ALTER VIEW [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> RESET ( <TT
CLASS="REPLACEABLE"
><I
>view_option_name</I
></TT
> [, ... ] )</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN68173"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>ALTER VIEW</TT
> changes various auxiliary properties
of a view. (If you want to modify the view's defining query,
use <TT
CLASS="COMMAND"
>CREATE OR REPLACE VIEW</TT
>.)
</P
><P
> You must own the view to use <TT
CLASS="COMMAND"
>ALTER VIEW</TT
>.
To change a view's schema, you must also have <TT
CLASS="LITERAL"
>CREATE</TT
>
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 <TT
CLASS="LITERAL"
>CREATE</TT
> 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.)
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN68182"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
> The name (optionally schema-qualified) of an existing view.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>IF EXISTS</TT
></DT
><DD
><P
> Do not throw an error if the view does not exist. A notice is issued
in this case.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>SET</TT
>/<TT
CLASS="LITERAL"
>DROP DEFAULT</TT
></DT
><DD
><P
> These forms set or remove the default value for a column.
A view column's default value is substituted into any
<TT
CLASS="COMMAND"
>INSERT</TT
> or <TT
CLASS="COMMAND"
>UPDATE</TT
> 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.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
></DT
><DD
><P
> The user name of the new owner of the view.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
></DT
><DD
><P
> The new name for the view.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_schema</I
></TT
></DT
><DD
><P
> The new schema for the view.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>view_option_name</I
></TT
></DT
><DD
><P
> The name of a view option to be set or reset.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>view_option_value</I
></TT
></DT
><DD
><P
> The new value for a view option.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN68228"
></A
><H2
>Notes</H2
><P
> For historical reasons, <TT
CLASS="COMMAND"
>ALTER TABLE</TT
> can be used with
views too; but the only variants of <TT
CLASS="COMMAND"
>ALTER TABLE</TT
>
that are allowed with views are equivalent to the ones shown above.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN68233"
></A
><H2
>Examples</H2
><P
> To rename the view <TT
CLASS="LITERAL"
>foo</TT
> to
<TT
CLASS="LITERAL"
>bar</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER VIEW foo RENAME TO bar;</PRE
><P>
</P
><P
> To attach a default column value to an updatable view:
</P><PRE
CLASS="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</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN68241"
></A
><H2
>Compatibility</H2
><P
> <TT
CLASS="COMMAND"
>ALTER VIEW</TT
> is a <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
extension of the SQL standard.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN68246"
></A
><H2
>See Also</H2
><A
HREF="sql-createview.html"
>CREATE VIEW</A
>, <A
HREF="sql-dropview.html"
>DROP VIEW</A
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