CREATE MATERIALIZED VIEW — define a new materialized view
CREATE MATERIALIZED VIEW [ IF NOT EXISTS ]table_name[ (column_name[, ...] ) ] [ USINGmethod] [ WITH (storage_parameter[=value] [, ... ] ) ] [ TABLESPACEtablespace_name] ASquery[ WITH [ NO ] DATA ]
   CREATE MATERIALIZED VIEW 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 WITH NO DATA is used) and may be
   refreshed later using REFRESH MATERIALIZED VIEW.
  
   CREATE MATERIALIZED VIEW is similar to
   CREATE TABLE AS, 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.
  
IF NOT EXISTSDo not throw an error if a materialized view with the same name already exists. A notice is issued in this case. Note that there is no guarantee that the existing materialized view is anything like the one that would have been created.
table_nameThe name (optionally schema-qualified) of the materialized view to be created.
column_nameThe 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.
USING method
      This optional clause specifies the table access method to use to store
      the contents for the new materialized view; the method needs be an
      access method of type TABLE. See Chapter 60 for more information.  If this option is not
      specified, the default table access method is chosen for the new
      materialized view. See default_table_access_method
      for more information.
     
WITH ( storage_parameter [= value] [, ... ] )
      This clause specifies optional storage parameters for the new
      materialized view; see Storage Parameters for more
      information.  All parameters supported for CREATE
      TABLE are also supported for CREATE MATERIALIZED
      VIEW.
      See CREATE TABLE for more information.
     
TABLESPACE tablespace_name
      The tablespace_name is the name
      of the tablespace in which the new materialized view is to be created.
      If not specified, default_tablespace is consulted.
     
queryA SELECT, TABLE, or VALUES command. This query will run within a security-restricted operation; in particular, calls to functions that themselves create temporary tables will fail.
WITH [ NO ] DATA
      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 REFRESH
      MATERIALIZED VIEW is used.
     
   CREATE MATERIALIZED VIEW is a
   PostgreSQL extension.