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Allow WITH clauses to be attached to INSERT, UPDATE, DELETE statements.

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This is not the hoped-for facility of using INSERT/UPDATE/DELETE inside
a WITH, but rather the other way around.  It seems useful in its own
right anyway.

Note: catversion bumped because, although the contents of stored rules
might look compatible, there's actually a subtle semantic change.
A single Query containing a WITH and INSERT...VALUES now represents
writing the WITH before the INSERT, not before the VALUES.  While it's
not clear that that matters to anyone, it seems like a good idea to
have it cited in the git history for catversion.h.

Original patch by Marko Tiikkaja, with updating and cleanup by
Hitoshi Harada.
This commit is contained in:
Tom Lane
2010-10-15 19:53:59 -04:00
parent 6ab42ae367
commit 07f1264dda
14 changed files with 333 additions and 44 deletions
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16
doc/src/sgml/ref/delete.sgml
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@@ -21,6 +21,7 @@ PostgreSQL documentation
<refsynopsisdiv>
<synopsis>
[ WITH [ RECURSIVE ] <replaceable class="parameter">with_query</replaceable> [, ...] ]
DELETE FROM [ ONLY ] <replaceable class="PARAMETER">table</replaceable> [ [ AS ] <replaceable class="parameter">alias</replaceable> ]
[ USING <replaceable class="PARAMETER">using_list</replaceable> ]
[ WHERE <replaceable class="PARAMETER">condition</replaceable> | WHERE CURRENT OF <replaceable class="PARAMETER">cursor_name</replaceable> ]
@@ -83,6 +84,18 @@ DELETE FROM [ ONLY ] <replaceable class="PARAMETER">table</replaceable> [ [ AS ]
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><replaceable class="parameter">with_query</replaceable></term>
<listitem>
<para>
The <literal>WITH</literal> clause allows you to specify one or more
subqueries that can be referenced by name in the <command>DELETE</>
query. See <xref linkend="queries-with"> and <xref linkend="sql-select">
for details.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>ONLY</></term>
<listitem>
@@ -272,7 +285,8 @@ DELETE FROM tasks WHERE CURRENT OF c_tasks;
<para>
This command conforms to the <acronym>SQL</acronym> standard, except
that the <literal>USING</literal> and <literal>RETURNING</> clauses
are <productname>PostgreSQL</productname> extensions.
are <productname>PostgreSQL</productname> extensions, as is the ability
to use <literal>WITH</> with <command>DELETE</>.
</para>
</refsect1>
</refentry>