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><H1
><A
NAME="SQL-CREATEMATERIALIZEDVIEW"
></A
>CREATE MATERIALIZED VIEW</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN74792"
></A
><H2
>Name</H2
>CREATE MATERIALIZED VIEW&nbsp;--&nbsp;define a new materialized view</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN74795"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>CREATE MATERIALIZED VIEW <TT
CLASS="REPLACEABLE"
><I
>table_name</I
></TT
>
    [ (<TT
CLASS="REPLACEABLE"
><I
>column_name</I
></TT
> [, ...] ) ]
    [ WITH ( <TT
CLASS="REPLACEABLE"
><I
>storage_parameter</I
></TT
> [= <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>] [, ... ] ) ]
    [ TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>tablespace_name</I
></TT
> ]
    AS <TT
CLASS="REPLACEABLE"
><I
>query</I
></TT
>
    [ WITH [ NO ] DATA ]</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74803"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>CREATE MATERIALIZED VIEW</TT
> defines a materialized view of
   a query.  The query is executed and used to populate the view at the time
   the command is issued (unless <TT
CLASS="COMMAND"
>WITH NO DATA</TT
> is used) and may be
   refreshed later using <TT
CLASS="COMMAND"
>REFRESH MATERIALIZED VIEW</TT
>.
  </P
><P
>   <TT
CLASS="COMMAND"
>CREATE MATERIALIZED VIEW</TT
> is similar to
   <TT
CLASS="COMMAND"
>CREATE TABLE AS</TT
>, except that it also remembers the query used
   to initialize the view, so that it can be refreshed later upon demand.
   A materialized view has many of the same properties as a table, but there
   is no support for temporary materialized views or automatic generation of
   OIDs.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74812"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>table_name</I
></TT
></DT
><DD
><P
>      The name (optionally schema-qualified) of the materialized view to be
      created.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>column_name</I
></TT
></DT
><DD
><P
>      The name of a column in the new materialized view.  If column names are
      not provided, they are taken from the output column names of the query.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>WITH ( <TT
CLASS="REPLACEABLE"
><I
>storage_parameter</I
></TT
> [= <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>] [, ... ] )</TT
></DT
><DD
><P
>      This clause specifies optional storage parameters for the new
      materialized view; see <A
HREF="sql-createtable.html#SQL-CREATETABLE-STORAGE-PARAMETERS"
><I
>Storage Parameters</I
></A
> for more
      information.  All parameters supported for <TT
CLASS="LITERAL"
>CREATE
      TABLE</TT
> are also supported for <TT
CLASS="LITERAL"
>CREATE MATERIALIZED
      VIEW</TT
> with the exception of <TT
CLASS="LITERAL"
>OIDS</TT
>.
      See <A
HREF="sql-createtable.html"
>CREATE TABLE</A
> for more information.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>tablespace_name</I
></TT
></TT
></DT
><DD
><P
>      The <TT
CLASS="REPLACEABLE"
><I
>tablespace_name</I
></TT
> is the name
      of the tablespace in which the new materialized view is to be created.
      If not specified, <A
HREF="runtime-config-client.html#GUC-DEFAULT-TABLESPACE"
>default_tablespace</A
> is consulted.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>query</I
></TT
></DT
><DD
><P
>      A <A
HREF="sql-select.html"
>SELECT</A
>, <A
HREF="sql-select.html#SQL-TABLE"
>TABLE</A
>,
      or <A
HREF="sql-values.html"
>VALUES</A
> command.  This query will run within a
      security-restricted operation; in particular, calls to functions that
      themselves create temporary tables will fail.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>WITH [ NO ] DATA</TT
></DT
><DD
><P
>      This clause specifies whether or not the materialized view should be
      populated at creation time.  If not, the materialized view will be
      flagged as unscannable and cannot be queried until <TT
CLASS="COMMAND"
>REFRESH
      MATERIALIZED VIEW</TT
> is used.
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74859"
></A
><H2
>Compatibility</H2
><P
>   <TT
CLASS="COMMAND"
>CREATE MATERIALIZED VIEW</TT
> is a
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> extension.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74864"
></A
><H2
>See Also</H2
><A
HREF="sql-altermaterializedview.html"
>ALTER MATERIALIZED VIEW</A
>, <A
HREF="sql-createtableas.html"
>CREATE TABLE AS</A
>, <A
HREF="sql-createview.html"
>CREATE VIEW</A
>, <A
HREF="sql-dropmaterializedview.html"
>DROP MATERIALIZED VIEW</A
>, <A
HREF="sql-refreshmaterializedview.html"
>REFRESH MATERIALIZED VIEW</A
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