<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >CREATE CONSTRAINT TRIGGER</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 8.2.14 Documentation" HREF="index.html"><LINK REL="UP" TITLE="SQL Commands" HREF="sql-commands.html"><LINK REL="PREVIOUS" TITLE="CREATE CAST" HREF="sql-createcast.html"><LINK REL="NEXT" TITLE="CREATE CONVERSION" HREF="sql-createconversion.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2009-09-04T05:25:47"></HEAD ><BODY CLASS="REFENTRY" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" >PostgreSQL 8.2.14 Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="sql-createcast.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="sql-createcast.html" >Fast Backward</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="sql-createconversion.html" >Fast Forward</A ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="sql-createconversion.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SQL-CREATECONSTRAINT" ></A >CREATE CONSTRAINT TRIGGER</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN46793" ></A ><H2 >Name</H2 >CREATE CONSTRAINT TRIGGER -- define a new constraint trigger</DIV ><A NAME="AEN46796" ></A ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN46798" ></A ><H2 >Synopsis</H2 ><PRE CLASS="SYNOPSIS" >CREATE CONSTRAINT TRIGGER <TT CLASS="REPLACEABLE" ><I >name</I ></TT > AFTER <TT CLASS="REPLACEABLE" ><I >event [ OR ... ]</I ></TT > ON <TT CLASS="REPLACEABLE" ><I >table_name</I ></TT > [ FROM <TT CLASS="REPLACEABLE" ><I >referenced_table_name</I ></TT > ] { NOT DEFERRABLE | [ DEFERRABLE ] { INITIALLY IMMEDIATE | INITIALLY DEFERRED } } FOR EACH ROW EXECUTE PROCEDURE <TT CLASS="REPLACEABLE" ><I >funcname</I ></TT > ( <TT CLASS="REPLACEABLE" ><I >arguments</I ></TT > )</PRE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN46806" ></A ><H2 >Description</H2 ><P > <TT CLASS="COMMAND" >CREATE CONSTRAINT TRIGGER</TT > is used within <TT CLASS="COMMAND" >CREATE TABLE</TT >/<TT CLASS="COMMAND" >ALTER TABLE</TT > and by <SPAN CLASS="APPLICATION" >pg_dump</SPAN > to create the special triggers for referential integrity. It is not intended for general use. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN46813" ></A ><H2 >Parameters</H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="REPLACEABLE" ><I >name</I ></TT ></DT ><DD ><P > The name of the constraint trigger. The actual name of the created trigger will be of the form <TT CLASS="LITERAL" >RI_ConstraintTrigger_0000</TT > (where 0000 is some number assigned by the server). Use this assigned name when dropping the trigger. </P ></DD ><DT ><TT CLASS="REPLACEABLE" ><I >event</I ></TT ></DT ><DD ><P > One of <TT CLASS="LITERAL" >INSERT</TT >, <TT CLASS="LITERAL" >UPDATE</TT >, or <TT CLASS="LITERAL" >DELETE</TT >; this specifies the event that will fire the trigger. Multiple events can be specified using <TT CLASS="LITERAL" >OR</TT >. </P ></DD ><DT ><TT CLASS="REPLACEABLE" ><I >table_name</I ></TT ></DT ><DD ><P > The (possibly schema-qualified) name of the table in which the triggering events occur. </P ></DD ><DT ><TT CLASS="REPLACEABLE" ><I >referenced_table_name</I ></TT ></DT ><DD ><P > The (possibly schema-qualified) name of the table referenced by the constraint. Used by foreign key constraints triggers. </P ></DD ><DT ><TT CLASS="LITERAL" >DEFERRABLE</TT ><BR><TT CLASS="LITERAL" >NOT DEFERRABLE</TT ><BR><TT CLASS="LITERAL" >INITIALLY IMMEDIATE</TT ><BR><TT CLASS="LITERAL" >INITIALLY DEFERRED</TT ></DT ><DD ><P > See the <A HREF="sql-createtable.html" ><I >CREATE TABLE</I ></A > documentation for details of these constraint options. </P ></DD ><DT ><TT CLASS="REPLACEABLE" ><I >funcname</I ></TT >(<TT CLASS="REPLACEABLE" ><I >args</I ></TT >)</DT ><DD ><P > The function to call as part of the trigger processing. See <A HREF="sql-createtrigger.html" ><I >CREATE TRIGGER</I ></A > for details. </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN46860" ></A ><H2 >Compatibility</H2 ><P > <TT CLASS="COMMAND" >CREATE CONTRAINT TRIGGER</TT > is a <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > extension of the <ACRONYM CLASS="ACRONYM" >SQL</ACRONYM > standard. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sql-createcast.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sql-createconversion.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >CREATE CAST</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="sql-commands.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >CREATE CONVERSION</TD ></TR ></TABLE ></DIV ></BODY ></HTML >