CREATE TABLE AS SQL - Language Statements CREATE TABLE AS define a new table from the results of a query CREATE TABLE AS CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name [ (column_name [, ...] ) ] [ WITH OIDS | WITHOUT OIDS ] [ ON COMMIT { PRESERVE ROWS | DELETE ROWS | DROP } ] [ TABLESPACE tablespace ] AS query CREATE TABLE AS creates a table and fills it with data computed by a SELECT command or an EXECUTE that runs a prepared 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. GLOBAL or LOCAL Ignored for compatibility. Refer to for details. TEMPORARY or TEMP If specified, the table is created as a temporary table. Refer to 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 OIDS WITHOUT OIDS This optional clause specifies whether the table created by CREATE TABLE AS should include OIDs. If neither form of this clause is specified, the value of the configuration parameter is used. 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 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, is used, or the database's default tablespace if default_tablespace is an empty string. query A query statement (that is, a SELECT command or an EXECUTE command that runs a prepared SELECT command). Refer to or , respectively, for a description of the allowed syntax. This command is functionally similar to , 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 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. 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'; Create a new temporary table that will be dropped at commit films_recent with oids consisting of only recent entries from the table films using a prepared statement: 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'); CREATE TABLE AS conforms to the SQL standard, with the following exceptions: The standard requires parentheses around the subquery clause; in PostgreSQL, these parentheses are optional. The standard defines a WITH [ NO ] DATA clause; this is not currently implemented by PostgreSQL. The behavior provided by PostgreSQL is equivalent to the standard's WITH DATA case. WITH/WITHOUT OIDS is a PostgreSQL extension. PostgreSQL handles temporary tables in a way rather different from the standard; see for details. The PostgreSQL concept of tablespaces is not part of the standard. Hence, the clause TABLESPACE is an extension.