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CREATE TABLE AS(7)               SQL Commands               CREATE TABLE AS(7)



NAME
       CREATE TABLE AS - define a new table from the results of a query


SYNOPSIS
       CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name
           [ (column_name [, ...] ) ]
           [ WITH ( storage_parameter [= value] [, ... ] ) | WITH OIDS | WITHOUT OIDS ]
           [ ON COMMIT { PRESERVE ROWS | DELETE ROWS | DROP } ]
           [ TABLESPACE tablespace ]
           AS query
           [ WITH [ NO ] DATA ]


DESCRIPTION
       CREATE  TABLE  AS  creates a table and fills it with data computed by a SELECT command.  The table columns have
       the names and data types associated with the output columns of the SELECT (except that  you  can  override  the
       column names by giving an explicit list of new column names).

       CREATE  TABLE  AS bears some resemblance to creating a view, but it is really quite different: it creates a new
       table and evaluates the query just once to fill the new table initially. The new table will  not  track  subse-
       quent changes to the source tables of the query. In contrast, a view re-evaluates its defining SELECT statement
       whenever it is queried.

PARAMETERS
       GLOBAL or LOCAL
              Ignored for compatibility. Refer to CREATE TABLE [create_table(7)] for details.


       TEMPORARY or TEMP
              If specified, the table is created as a temporary table.  Refer to CREATE  TABLE  [create_table(7)]  for
              details.

       table_name
              The name (optionally schema-qualified) of the table to be created.

       column_name
              The  name of a column in the new table. If column names are not provided, they are taken from the output
              column names of the query. If the table is created from an EXECUTE command, a column name list cannot be
              specified.

       WITH ( storage_parameter [= value] [, ... ] )
              This  clause specifies optional storage parameters for the new table; see Storage Parameters [create_ta-
              ble(7)] for more information. The WITH clause can also include OIDS=TRUE (or just OIDS) to specify  that
              rows  of  the new table should have OIDs (object identifiers) assigned to them, or OIDS=FALSE to specify
              that the rows should not have OIDs.  See CREATE TABLE [create_table(7)] for more information.

       WITH OIDS

       WITHOUT OIDS
              These are obsolescent syntaxes equivalent to WITH (OIDS) and WITH  (OIDS=FALSE),  respectively.  If  you
              wish  to  give  both  an  OIDS setting and storage parameters, you must use the WITH ( ... ) syntax; see
              above.

       ON COMMIT
              The behavior of temporary tables at the end of a transaction block can be controlled  using  ON  COMMIT.
              The three options are:

              PRESERVE ROWS
                     No special action is taken at the ends of transactions.  This is the default behavior.

              DELETE ROWS
                     All  rows  in  the  temporary  table will be deleted at the end of each transaction block. Essen-
                     tially, an automatic TRUNCATE [truncate(7)] is done at each commit.

              DROP   The temporary table will be dropped at the end of the current transaction block.


       TABLESPACE tablespace
              The tablespace is the name of the tablespace in which the new table is to be created.  If not specified,
              default_tablespace is consulted, or temp_tablespaces if the table is temporary.

       query  A SELECT [select(7)], TABLE, or VALUES [values(7)] command, or an EXECUTE [execute(7)] command that runs
              a prepared SELECT, TABLE, or VALUES query.

       WITH [ NO ] DATA
              This clause specifies whether or not the data produced by the query should be copied into the new table.
              If not, only the table structure is copied. The default is to copy the data.

NOTES
       This  command  is  functionally  similar  to SELECT INTO [select_into(7)], but it is preferred since it is less
       likely to be confused with other uses of the SELECT INTO syntax. Furthermore, CREATE TABLE AS offers a superset
       of the functionality offered by SELECT INTO.

       Prior  to  PostgreSQL  8.0, CREATE TABLE AS always included OIDs in the table it created. As of PostgreSQL 8.0,
       the CREATE TABLE AS command allows the user to explicitly specify whether OIDs should be included. If the pres-
       ence  of  OIDs  is  not explicitly specified, the default_with_oids configuration variable is used. As of Post-
       greSQL 8.1, this variable is false by default, so the default behavior is not identical  to  pre-8.0  releases.
       Applications that require OIDs in the table created by CREATE TABLE AS should explicitly specify WITH (OIDS) to
       ensure proper behavior.

EXAMPLES
       Create a new table films_recent consisting of only recent entries from the table films:

       CREATE TABLE films_recent AS
         SELECT * FROM films WHERE date_prod >= '2002-01-01';


       To copy a table completely, the short form using the TABLE command can also be used:

       CREATE TABLE films2 AS
         TABLE films;


       Create a new temporary table films_recent, consisting of only recent entries from the table films, using a pre-
       pared statement. The new table has OIDs and will be dropped at commit:

       PREPARE recentfilms(date) AS
         SELECT * FROM films WHERE date_prod > $1;
       CREATE TEMP TABLE films_recent WITH (OIDS) ON COMMIT DROP AS
         EXECUTE recentfilms('2002-01-01');


COMPATIBILITY
       CREATE TABLE AS conforms to the SQL standard. The following are nonstandard extensions:

       ? The  standard requires parentheses around the subquery clause; in PostgreSQL, these parentheses are optional.

       ? In the standard, the WITH [ NO ] DATA clause is required; in PostgreSQL it is optional.

       ? PostgreSQL handles temporary tables in a way rather different from the standard; see CREATE TABLE [create_ta-
         ble(7)] for details.

       ? The WITH clause is a PostgreSQL extension; neither storage parameters nor OIDs are in the standard.

       ? The  PostgreSQL concept of tablespaces is not part of the standard. Hence, the clause TABLESPACE is an exten-
         sion.


SEE ALSO
       CREATE TABLE [create_table(7)], EXECUTE [execute(7)], SELECT [select(7)], SELECT INTO [select_into(7)],  VALUES
       [values(7)]



SQL - Language Statements         2014-02-17                CREATE TABLE AS(7)