Movatterモバイル変換

CREATE TABLE AS

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

Synopsis

CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXISTS ]table_name    [ (column_name [, ...] ) ]    [ USINGmethod ]    [ WITH (storage_parameter [=value] [, ... ] ) | WITHOUT OIDS ]    [ ON COMMIT { PRESERVE ROWS | DELETE ROWS | DROP } ]    [ TABLESPACEtablespace_name ]    ASquery    [ WITH [ NO ] DATA ]

Description

CREATE TABLE AS creates a table and fills it with data computed by aSELECT command. The table columns have the names and data types associated with the output columns of theSELECT (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 definingSELECT statement whenever it is queried.

CREATE TABLE AS requiresCREATE privilege on the schema used for the table.

Parameters

Notes

This command is functionally similar toSELECT INTO, but it is preferred since it is less likely to be confused with other uses of theSELECT INTO syntax. Furthermore,CREATE TABLE AS offers a superset of the functionality offered bySELECT INTO.

Examples

Create a new tablefilms_recent consisting of only recent entries from the tablefilms:

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

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

CREATE TABLE films2 AS  TABLE films;

Create a new temporary tablefilms_recent, consisting of only recent entries from the tablefilms, using a prepared statement. The new table will be dropped at commit:

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

Compatibility

CREATE TABLE AS conforms to theSQL standard. The following are nonstandard extensions:

See Also