1999-07-22 17:09:15 +02:00
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2001-12-08 04:24:40 +01:00
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table_as.sgml,v 1.9 2001/12/08 03:24:35 thomas Exp $
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PostgreSQL documentation
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1999-07-22 17:09:15 +02:00
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-->
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<refentry id="SQL-CREATETABLEAS">
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1999-06-14 09:37:05 +02:00
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<refmeta>
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<refentrytitle>CREATE TABLE AS</refentrytitle>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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1999-06-14 09:37:05 +02:00
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<refnamediv>
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<refname>CREATE TABLE AS</refname>
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<refpurpose>create a new table from the results of a query</refpurpose>
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</refnamediv>
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1999-06-14 09:37:05 +02:00
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<refsynopsisdiv>
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<synopsis>
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CREATE [ [ LOCAL ] { TEMPORARY | TEMP } ] TABLE <replaceable>table_name</replaceable> [ (<replaceable>column_name</replaceable> [, ...] ) ]
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AS <replaceable>query</replaceable>
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</synopsis>
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</refsynopsisdiv>
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1999-06-14 09:37:05 +02:00
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<refsect1>
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<refsect1info>
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<date>2001-03-20</date>
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</refsect1info>
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<title>
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Description
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</title>
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<para>
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<command>CREATE TABLE AS</command> creates a table and fills it
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with data computed by a <command>SELECT</command> command. The
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table columns have the names and data types associated with the
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output columns of the <command>SELECT</command> (except that you
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can override the column names by giving an explicit list of new
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column names).
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</para>
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<para>
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<command>CREATE TABLE AS</command> bears some resemblance to
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creating a view, but it is really quite different: it creates a new
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table and evaluates the query just once to fill the new table
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initially. The new table will not track subsequent changes to the
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source tables of the query. In contrast, a view re-evaluates the
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underlying <command>SELECT</command> statements whenever it is
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queried.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><literal>[LOCAL] TEMPORARY</> or <literal>[LOCAL] TEMP</></term>
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<listitem>
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<para>
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If specified, the table is created as a temporary table.
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Temporary tables are automatically dropped at the end of a
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session. Existing persistent tables with the same name are not
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visible to the current session while the temporary table exists.
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Any indexes created on a temporary table are automatically
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temporary as well.
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</para>
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<para>
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The <literal>LOCAL</literal> word is optional.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>table_name</replaceable></term>
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<listitem>
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<para>
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The name of the new table to be created. This table must not
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already exist. However, a temporary table can be created that
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has the same name as an existing permanent table.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>column_name</replaceable></term>
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<listitem>
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<para>
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The name of a column in the new table. Multiple column names can
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be specified using a comma-delimited list of column names. If
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column names are not provided, they are taken from the output
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column names of the query.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>query</replaceable></term>
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<listitem>
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<para>
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A query statement (that is, a <command>SELECT</command>
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command). Refer to
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<xref linkend="sql-select">
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for a description of the allowed syntax.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Diagnostics</title>
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<para>
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Refer to <xref linkend="sql-createtable"> and
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<xref linkend="sql-select">
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for a summary of possible output messages.
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</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>
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This command is functionally equivalent to <xref
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linkend="sql-selectinto">, but it is preferred since it is less
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likely to be confused with other uses of the <command>SELECT
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... INTO</command> syntax.
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</para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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This command is modeled after an <productname>Oracle</productname>
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feature. There is no command with equivalent functionality in
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SQL92 or SQL99. However, a combination of <literal>CREATE
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TABLE</literal> and <literal>INSERT ... SELECT</literal> can
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accomplish the same thing with little more effort.
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</para>
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</refsect1>
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<refsect1>
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<title>History</title>
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<para>
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The <command>CREATE TABLE AS</command> command has been available
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since <productname>PostgreSQL</productname> 6.3.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-createtable"></member>
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<member><xref linkend="sql-createview"></member>
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<member><xref linkend="sql-select"></member>
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<member><xref linkend="sql-selectinto"></member>
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</simplelist>
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</refsect1>
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1999-06-14 09:37:05 +02:00
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:nil
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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sgml-parent-document:nil
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sgml-default-dtd-file:"../reference.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:"/usr/lib/sgml/catalog"
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sgml-local-ecat-files:nil
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End:
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-->
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