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postgresql8.3-docs-8.3.6-2mdv2008.1.x86_64.rpm

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><H1
><A
NAME="SQL-CREATETABLEAS"
></A
>CREATE TABLE AS</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN54416"
></A
><H2
>Name</H2
>CREATE TABLE AS&nbsp;--&nbsp;define a new table from the results of a query</DIV
><A
NAME="AEN54419"
></A
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN54421"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE <TT
CLASS="REPLACEABLE"
><I
>table_name</I
></TT
>
    [ (<TT
CLASS="REPLACEABLE"
><I
>column_name</I
></TT
> [, ...] ) ]
    [ WITH ( <TT
CLASS="REPLACEABLE"
><I
>storage_parameter</I
></TT
> [= <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>] [, ... ] ) | WITH OIDS | WITHOUT OIDS ]
    [ ON COMMIT { PRESERVE ROWS | DELETE ROWS | DROP } ]
    [ TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>tablespace</I
></TT
> ]
    AS <TT
CLASS="REPLACEABLE"
><I
>query</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54429"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>CREATE TABLE AS</TT
> creates a table and fills it
   with data computed by a <TT
CLASS="COMMAND"
>SELECT</TT
> command.
   The table columns have the
   names and data types associated with the output columns of the
   <TT
CLASS="COMMAND"
>SELECT</TT
> (except that you can override the column
   names by giving an explicit list of new column names).
  </P
><P
>   <TT
CLASS="COMMAND"
>CREATE TABLE AS</TT
> 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 <TT
CLASS="COMMAND"
>SELECT</TT
> statement whenever it is
   queried.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54438"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>GLOBAL</TT
> or <TT
CLASS="LITERAL"
>LOCAL</TT
></DT
><DD
><P
>      Ignored for compatibility. Refer to <A
HREF="sql-createtable.html"
><I
>CREATE TABLE</I
></A
> for
      details.
     </P
></DD
></DL
></DIV
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>TEMPORARY</TT
> or <TT
CLASS="LITERAL"
>TEMP</TT
></DT
><DD
><P
>      If specified, the table is created as a temporary table.
      Refer to <A
HREF="sql-createtable.html"
><I
>CREATE TABLE</I
></A
> for details.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>table_name</I
></TT
></DT
><DD
><P
>      The name (optionally schema-qualified) of the table to be created.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>column_name</I
></TT
></DT
><DD
><P
>      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
      <TT
CLASS="COMMAND"
>EXECUTE</TT
> command, a column name list cannot be
      specified.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>WITH ( <TT
CLASS="REPLACEABLE"
><I
>storage_parameter</I
></TT
> [= <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>] [, ... ] )</TT
></DT
><DD
><P
>      This clause specifies optional storage parameters for the new table;
      see <A
HREF="sql-createtable.html#SQL-CREATETABLE-STORAGE-PARAMETERS"
><I
>Storage Parameters</I
></A
> for more
      information.  The <TT
CLASS="LITERAL"
>WITH</TT
> clause
      can also include <TT
CLASS="LITERAL"
>OIDS=TRUE</TT
> (or just <TT
CLASS="LITERAL"
>OIDS</TT
>)
      to specify that rows of the new table
      should have OIDs (object identifiers) assigned to them, or
      <TT
CLASS="LITERAL"
>OIDS=FALSE</TT
> to specify that the rows should not have OIDs.
      See <A
HREF="sql-createtable.html"
><I
>CREATE TABLE</I
></A
> for more information.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>WITH OIDS</TT
><BR><TT
CLASS="LITERAL"
>WITHOUT OIDS</TT
></DT
><DD
><P
>      These are obsolescent syntaxes equivalent to <TT
CLASS="LITERAL"
>WITH (OIDS)</TT
>
      and <TT
CLASS="LITERAL"
>WITH (OIDS=FALSE)</TT
>, respectively.  If you wish to give
      both an <TT
CLASS="LITERAL"
>OIDS</TT
> setting and storage parameters, you must use
      the <TT
CLASS="LITERAL"
>WITH ( ... )</TT
> syntax; see above.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>ON COMMIT</TT
></DT
><DD
><P
>      The behavior of temporary tables at the end of a transaction
      block can be controlled using <TT
CLASS="LITERAL"
>ON COMMIT</TT
>.
      The three options are:

      <P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>PRESERVE ROWS</TT
></DT
><DD
><P
>          No special action is taken at the ends of transactions.
          This is the default behavior.
         </P
></DD
><DT
><TT
CLASS="LITERAL"
>DELETE ROWS</TT
></DT
><DD
><P
>          All rows in the temporary table will be deleted at the end
          of each transaction block.  Essentially, an automatic <A
HREF="sql-truncate.html"
><I
>TRUNCATE</I
></A
> is done
          at each commit.
         </P
></DD
><DT
><TT
CLASS="LITERAL"
>DROP</TT
></DT
><DD
><P
>          The temporary table will be dropped at the end of the current
          transaction block.
         </P
></DD
></DL
></DIV
><P>
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>tablespace</I
></TT
></TT
></DT
><DD
><P
>      The <TT
CLASS="REPLACEABLE"
><I
>tablespace</I
></TT
> is the name
      of the tablespace in which the new table is to be created.
      If not specified,
      <A
HREF="runtime-config-client.html#GUC-DEFAULT-TABLESPACE"
>default_tablespace</A
> is consulted, or
      <A
HREF="runtime-config-client.html#GUC-TEMP-TABLESPACES"
>temp_tablespaces</A
> if the table is temporary.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>query</I
></TT
></DT
><DD
><P
>      A <A
HREF="sql-select.html"
><I
>SELECT</I
></A
> or
      <A
HREF="sql-values.html"
><I
>VALUES</I
></A
> command,
      or an <A
HREF="sql-execute.html"
><I
>EXECUTE</I
></A
> command
      that runs a prepared <TT
CLASS="COMMAND"
>SELECT</TT
> or <TT
CLASS="COMMAND"
>VALUES</TT
> query.
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54533"
></A
><H2
>Notes</H2
><P
>   This command is functionally similar to <A
HREF="sql-selectinto.html"
><I
>SELECT INTO</I
></A
>, but it is
   preferred since it is less likely to be confused with other uses of
   the <TT
CLASS="COMMAND"
>SELECT INTO</TT
> syntax. Furthermore, <TT
CLASS="COMMAND"
>CREATE
   TABLE AS</TT
> offers a superset of the functionality offered
   by <TT
CLASS="COMMAND"
>SELECT INTO</TT
>.
  </P
><P
>   Prior to <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 8.0, <TT
CLASS="COMMAND"
>CREATE
   TABLE AS</TT
> always included OIDs in the table it
   created.  As of <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 8.0,
   the <TT
CLASS="COMMAND"
>CREATE TABLE AS</TT
> command allows the user to
   explicitly specify whether OIDs should be included. If the
   presence of OIDs is not explicitly specified,
   the <A
HREF="runtime-config-compatible.html#GUC-DEFAULT-WITH-OIDS"
>default_with_oids</A
> configuration variable is
   used.  As of <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 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 <TT
CLASS="COMMAND"
>CREATE TABLE
   AS</TT
> should explicitly specify <TT
CLASS="LITERAL"
>WITH (OIDS)</TT
>
   to ensure proper behavior.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54549"
></A
><H2
>Examples</H2
><P
>   Create a new table <TT
CLASS="LITERAL"
>films_recent</TT
> consisting of only
   recent entries from the table <TT
CLASS="LITERAL"
>films</TT
>:

</P><PRE
CLASS="PROGRAMLISTING"
>CREATE TABLE films_recent AS
  SELECT * FROM films WHERE date_prod &gt;= '2002-01-01';</PRE
><P>
  </P
><P
>   Create a new temporary table <TT
CLASS="LITERAL"
>films_recent</TT
>, consisting of
   only recent entries from the table <TT
CLASS="LITERAL"
>films</TT
>, using a
   prepared statement.  The new table has OIDs and will be dropped at commit:

</P><PRE
CLASS="PROGRAMLISTING"
>PREPARE recentfilms(date) AS
  SELECT * FROM films WHERE date_prod &gt; $1;
CREATE TEMP TABLE films_recent WITH (OIDS) ON COMMIT DROP AS
  EXECUTE recentfilms('2002-01-01');</PRE
><P>
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54559"
></A
><H2
>Compatibility</H2
><P
>   <TT
CLASS="COMMAND"
>CREATE TABLE AS</TT
> conforms to the <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
>
   standard, with the following exceptions:

   <P
></P
></P><UL
COMPACT="COMPACT"
><LI
><P
>      The standard requires parentheses around the subquery clause; in
      <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>, these parentheses are
      optional.
     </P
></LI
><LI
><P
>      The standard defines a <TT
CLASS="LITERAL"
>WITH [ NO ] DATA</TT
> clause;
      this is not currently implemented by <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>.
      The behavior provided by <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> is equivalent
      to the standard's <TT
CLASS="LITERAL"
>WITH DATA</TT
> case.
      <TT
CLASS="LITERAL"
>WITH NO DATA</TT
> can be simulated by appending
      <TT
CLASS="LITERAL"
>LIMIT 0</TT
> to the query.
     </P
></LI
><LI
><P
>      <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> handles temporary tables in a way
      rather different from the standard; see
      <A
HREF="sql-createtable.html"
><I
>CREATE TABLE</I
></A
>
      for details.
     </P
></LI
><LI
><P
>      The <TT
CLASS="LITERAL"
>WITH</TT
> clause is a <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
      extension; neither storage parameters nor OIDs are in the standard.
     </P
></LI
><LI
><P
>      The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> concept of tablespaces is not
      part of the standard.  Hence, the clause <TT
CLASS="LITERAL"
>TABLESPACE</TT
>
      is an extension.
     </P
></LI
></UL
><P>
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54588"
></A
><H2
>See Also</H2
><A
HREF="sql-createtable.html"
><I
>CREATE TABLE</I
></A
>, <A
HREF="sql-execute.html"
><I
>EXECUTE</I
></A
>, <A
HREF="sql-select.html"
><I
>SELECT</I
></A
>, <A
HREF="sql-selectinto.html"
><I
>SELECT INTO</I
></A
>, <A
HREF="sql-values.html"
><I
>VALUES</I
></A
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