mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-21 11:03:23 +02:00
157 lines
4.8 KiB
Plaintext
157 lines
4.8 KiB
Plaintext
<!--
|
|
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table_as.sgml,v 1.16 2003/09/09 18:28:53 tgl Exp $
|
|
PostgreSQL documentation
|
|
-->
|
|
|
|
<refentry id="SQL-CREATETABLEAS">
|
|
<refmeta>
|
|
<refentrytitle id="sql-createtableas-title">CREATE TABLE AS</refentrytitle>
|
|
<refmiscinfo>SQL - Language Statements</refmiscinfo>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>CREATE TABLE AS</refname>
|
|
<refpurpose>create a new table from the results of a query</refpurpose>
|
|
</refnamediv>
|
|
|
|
<indexterm zone="sql-createtableas">
|
|
<primary>CREATE TABLE AS</primary>
|
|
</indexterm>
|
|
|
|
<refsynopsisdiv>
|
|
<synopsis>
|
|
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE <replaceable>table_name</replaceable> [ (<replaceable>column_name</replaceable> [, ...] ) ]
|
|
AS <replaceable>query</replaceable>
|
|
</synopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>
|
|
<command>CREATE TABLE AS</command> creates a table and fills it
|
|
with data computed by a <command>SELECT</command> command or an
|
|
<command>EXECUTE</command> that runs a prepared
|
|
<command>SELECT</command> command. The table columns have the
|
|
names and data types associated with the output columns of the
|
|
<command>SELECT</command> (except that you can override the column
|
|
names by giving an explicit list of new column names).
|
|
</para>
|
|
|
|
<para>
|
|
<command>CREATE TABLE AS</command> 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 <command>SELECT</command> statement whenever it is
|
|
queried.
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Parameters</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><literal>TEMPORARY</> or <literal>TEMP</></term>
|
|
<listitem>
|
|
<para>
|
|
If specified, the table is created as a temporary table.
|
|
Refer to <xref linkend="sql-createtable" endterm="sql-createtable-title"> for details.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><replaceable>table_name</replaceable></term>
|
|
<listitem>
|
|
<para>
|
|
The name (optionally schema-qualified) of the table to be created.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><replaceable>column_name</replaceable></term>
|
|
<listitem>
|
|
<para>
|
|
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 out of an
|
|
<command>EXECUTE</command> command, a column name list can
|
|
currently not be specified.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><replaceable>query</replaceable></term>
|
|
<listitem>
|
|
<para>
|
|
A query statement (that is, a <command>SELECT</command> command
|
|
or an <command>EXECUTE</command> command that runs a prepared
|
|
<command>SELECT</command> command). Refer to <xref
|
|
linkend="sql-select" endterm="sql-select-title"> or <xref
|
|
linkend="sql-execute" endterm="sql-execute-title">,
|
|
respectively, for a description of the allowed syntax.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Notes</title>
|
|
|
|
<para>
|
|
This command is functionally equivalent to <xref
|
|
linkend="sql-selectinto" endterm="sql-selectinto-title">, but it is preferred since it is less
|
|
likely to be confused with other uses of the <command>SELECT
|
|
... INTO</command> syntax.
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Compatibility</title>
|
|
|
|
<para>
|
|
This command is modeled after an <productname>Oracle</productname>
|
|
feature. There is no command with equivalent functionality in
|
|
the SQL standard. However, a combination of <literal>CREATE
|
|
TABLE</literal> and <literal>INSERT ... SELECT</literal> can
|
|
accomplish the same thing with little more effort.
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
|
|
<simplelist type="inline">
|
|
<member><xref linkend="sql-createtable" endterm="sql-createtable-title"></member>
|
|
<member><xref linkend="sql-createview" endterm="sql-createview-title"></member>
|
|
<member><xref linkend="sql-execute" endterm="sql-execute-title"></member>
|
|
<member><xref linkend="sql-select" endterm="sql-select-title"></member>
|
|
<member><xref linkend="sql-selectinto" endterm="sql-selectinto-title"></member>
|
|
</simplelist>
|
|
</refsect1>
|
|
|
|
</refentry>
|
|
|
|
<!-- Keep this comment at the end of the file
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-omittag:nil
|
|
sgml-shorttag:t
|
|
sgml-minimize-attributes:nil
|
|
sgml-always-quote-attributes:t
|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"../reference.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:"/usr/lib/sgml/catalog"
|
|
sgml-local-ecat-files:nil
|
|
End:
|
|
-->
|