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CREATE TABLE AS(7) PostgreSQL 9.2.24 Documentation CREATE TABLE AS(7)
NAME
CREATE_TABLE_AS - define a new table from the results of a query
SYNOPSIS
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE table_name
[ (column_name [, ...] ) ]
[ WITH ( storage_parameter [= value] [, ... ] ) | WITH OIDS | WITHOUT OIDS ]
[ ON COMMIT { PRESERVE ROWS | DELETE ROWS | DROP } ]
[ TABLESPACE tablespace_name ]
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 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. Use of these keywords is deprecated; 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.
UNLOGGED
If specified, the table is created as an unlogged 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.
WITH ( storage_parameter [= value] [, ... ] )
This clause specifies optional storage parameters for the new table; see Storage
Parameters 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. Essentially, an automatic TRUNCATE(7) is done at each commit.
DROP
The temporary table will be dropped at the end of the current transaction block.
TABLESPACE tablespace_name
The tablespace_name 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(7), TABLE, or VALUES(7) command, or an 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 desired 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 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:
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(7), SELECT(7), SELECT INTO (SELECT_INTO(7)),
VALUES(7)
PostgreSQL 9.2.24 2017-11-06 CREATE TABLE AS(7)
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