<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >referential_constraints</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 8.0.11 Documentation" HREF="index.html"><LINK REL="UP" TITLE="The Information Schema" HREF="information-schema.html"><LINK REL="PREVIOUS" TITLE="parameters" HREF="infoschema-parameters.html"><LINK REL="NEXT" TITLE="role_column_grants" HREF="infoschema-role-column-grants.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="2007-02-02T03:57:22"></HEAD ><BODY CLASS="SECT1" ><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 8.0.11 Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="infoschema-parameters.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="information-schema.html" >Fast Backward</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 30. The Information Schema</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="information-schema.html" >Fast Forward</A ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="infoschema-role-column-grants.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="INFOSCHEMA-REFERENTIAL-CONSTRAINTS" >30.20. <TT CLASS="LITERAL" >referential_constraints</TT ></A ></H1 ><P > The view <TT CLASS="LITERAL" >referential_constraints</TT > contains all referential (foreign key) constraints in the current database that belong to a table owned by the current user. </P ><DIV CLASS="TABLE" ><A NAME="AEN27536" ></A ><P ><B >Table 30-18. <TT CLASS="LITERAL" >referential_constraints</TT > Columns</B ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><COL><COL><COL><THEAD ><TR ><TH >Name</TH ><TH >Data Type</TH ><TH >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD ><TT CLASS="LITERAL" >constraint_catalog</TT ></TD ><TD ><TT CLASS="LITERAL" >sql_identifier</TT ></TD ><TD >Name of the database containing the constraint (always the current database)</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >constraint_schema</TT ></TD ><TD ><TT CLASS="LITERAL" >sql_identifier</TT ></TD ><TD >Name of the schema containing the constraint</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >constraint_name</TT ></TD ><TD ><TT CLASS="LITERAL" >sql_identifier</TT ></TD ><TD >Name of the constraint</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >unique_constraint_catalog</TT ></TD ><TD ><TT CLASS="LITERAL" >sql_identifier</TT ></TD ><TD > Name of the database that contains the unique or primary key constraint that the foreign key constraint references (always the current database) </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >unique_constraint_schema</TT ></TD ><TD ><TT CLASS="LITERAL" >sql_identifier</TT ></TD ><TD > Name of the schema that contains the unique or primary key constraint that the foreign key constraint references </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >unique_constraint_name</TT ></TD ><TD ><TT CLASS="LITERAL" >sql_identifier</TT ></TD ><TD > Name of the unique or primary key constraint that the foreign key constraint references </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >match_option</TT ></TD ><TD ><TT CLASS="LITERAL" >character_data</TT ></TD ><TD > Match option of the foreign key constraint: <TT CLASS="LITERAL" >FULL</TT >, <TT CLASS="LITERAL" >PARTIAL</TT >, or <TT CLASS="LITERAL" >NONE</TT >. </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >update_rule</TT ></TD ><TD ><TT CLASS="LITERAL" >character_data</TT ></TD ><TD > Update rule of the foreign key constraint: <TT CLASS="LITERAL" >CASCADE</TT >, <TT CLASS="LITERAL" >SET NULL</TT >, <TT CLASS="LITERAL" >SET DEFAULT</TT >, <TT CLASS="LITERAL" >RESTRICT</TT >, or <TT CLASS="LITERAL" >NO ACTION</TT >. </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >delete_rule</TT ></TD ><TD ><TT CLASS="LITERAL" >character_data</TT ></TD ><TD > Delete rule of the foreign key constraint: <TT CLASS="LITERAL" >CASCADE</TT >, <TT CLASS="LITERAL" >SET NULL</TT >, <TT CLASS="LITERAL" >SET DEFAULT</TT >, <TT CLASS="LITERAL" >RESTRICT</TT >, or <TT CLASS="LITERAL" >NO ACTION</TT >. </TD ></TR ></TBODY ></TABLE ></DIV ></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="infoschema-parameters.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="infoschema-role-column-grants.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><TT CLASS="LITERAL" >parameters</TT ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="information-schema.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><TT CLASS="LITERAL" >role_column_grants</TT ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >