2002-06-03 03:10:38 +02:00
|
|
|
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/set_constraints.sgml,v 1.4 2002/06/03 01:10:38 momjian Exp $ -->
|
2000-06-18 23:24:54 +02:00
|
|
|
<refentry id="SQL-SET-CONSTRAINTS">
|
|
|
|
<refmeta>
|
|
|
|
<refentrytitle id="SQL-SET-CONSTRAINTS-title">SET CONSTRAINTS</refentrytitle>
|
|
|
|
<refmiscinfo>SQL - Language Statements</refmiscinfo>
|
|
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
|
|
<refname>SET CONSTRAINTS</refname>
|
2001-09-03 14:57:50 +02:00
|
|
|
<refpurpose>set the constraint mode of the current transaction</refpurpose>
|
2000-06-18 23:24:54 +02:00
|
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
|
|
<refsynopsisdivinfo>
|
|
|
|
<date>2000-06-01</date>
|
|
|
|
</refsynopsisdivinfo>
|
|
|
|
<synopsis>
|
|
|
|
SET CONSTRAINTS { ALL | <replaceable class="parameter">constraint</replaceable> [, ...] } { DEFERRED | IMMEDIATE }
|
|
|
|
</synopsis>
|
|
|
|
</refsynopsisdiv>
|
|
|
|
|
|
|
|
<refsect1>
|
|
|
|
<title>Description</title>
|
|
|
|
|
|
|
|
<para>
|
|
|
|
<command>SET CONSTRAINTS</command> sets the behavior of constraint
|
|
|
|
evaluation in the current transaction. In
|
|
|
|
<option>IMMEDIATE</option> mode, constraints are checked at the end
|
|
|
|
of each statement. In <option>DEFERRED</option> mode, constraints
|
|
|
|
are not checked until transaction commit.
|
|
|
|
</para>
|
|
|
|
|
|
|
|
<para>
|
|
|
|
Upon creation, a constraint is always give one of three
|
|
|
|
characteristics: <option>INITIALLY DEFERRED</option>,
|
|
|
|
<option>INITIALLY IMMEDIATE DEFERRABLE</option>, or
|
|
|
|
<option>INITIALLY IMMEDIATE NOT DEFERRABLE</option>. The third
|
|
|
|
class is not affected by the <command>SET CONSTRAINTS</command>
|
|
|
|
command.
|
|
|
|
</para>
|
|
|
|
|
|
|
|
<para>
|
|
|
|
Currently, only foreign key constraints are affected by this
|
|
|
|
setting. Check and unique constraints are always effectively
|
|
|
|
initially immediate not deferrable.
|
|
|
|
</para>
|
|
|
|
</refsect1>
|
|
|
|
|
2000-07-14 17:27:14 +02:00
|
|
|
<refsect1 id="R1-SQL-SET-CONSTRAINT-3">
|
2000-06-18 23:24:54 +02:00
|
|
|
<title>Compatibility</title>
|
2000-07-14 17:27:14 +02:00
|
|
|
|
|
|
|
<refsect2 id="R2-SQL-SET-CONSTRAINT-4">
|
|
|
|
<title>SQL92, SQL99</title>
|
|
|
|
|
|
|
|
<para>
|
2002-06-03 03:10:38 +02:00
|
|
|
<command>SET CONSTRAINTS</command> is defined in
|
2000-07-14 17:27:14 +02:00
|
|
|
<acronym>SQL92</acronym> and <acronym>SQL99</acronym>.
|
|
|
|
</para>
|
|
|
|
</refsect2>
|
2000-06-18 23:24:54 +02:00
|
|
|
</refsect1>
|
|
|
|
</refentry>
|
2000-07-14 17:27:14 +02:00
|
|
|
|
|
|
|
<!-- 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:
|
|
|
|
-->
|