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 asso-
       ciated 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 subsequent 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_table(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 identi-
	      fiers) 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 set-
	      ting 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.  Essentially,  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 con-
	      sulted, 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  presence  of	OIDs  is  not  explicitly  specified,  the
       default_with_oids  configuration  variable is used. As of PostgreSQL 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 prepared statement. The new ta-
       ble 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:

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

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

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

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

       o The PostgreSQL concept of tablespaces is not part of the standard. Hence, the clause TABLESPACE is an extension.

SEE ALSO

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

SQL - Language Statements					    2010-05-14							CREATE TABLE AS(7)