Postgres Plus Advanced Server Oracle Compatibility Developer's Guide :

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3.3.23 CREATE TABLE AS

Name

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

Synopsis

CREATE [ GLOBAL TEMPORARY ] TABLE table_name
  [ (column_name [, ...] ) ]
  [ ON COMMIT { PRESERVE ROWS | DELETE ROWS } ]
  [ TABLESPACE tablespace ]
  AS query

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 TEMPORARY

      If specified, the table is created as a temporary table. Refer to CREATE TABLE 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.

query

      A query statement ( a SELECT command). Refer to SELECT for a description of the allowed syntax.

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