<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >constraint_table_usage</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="constraint_column_usage" HREF="infoschema-constraint-column-usage.html"><LINK REL="NEXT" TITLE="data_type_privileges" HREF="infoschema-data-type-privileges.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-constraint-column-usage.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-data-type-privileges.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="INFOSCHEMA-CONSTRAINT-TABLE-USAGE" >30.11. <TT CLASS="LITERAL" >constraint_table_usage</TT ></A ></H1 ><P > The view <TT CLASS="LITERAL" >constraint_table_usage</TT > identifies all tables in the current database that are used by some constraint and are owned by the current user. (This is different from the view <TT CLASS="LITERAL" >table_constraints</TT >, which identifies all table constraints along with the table they are defined on.) For a foreign key constraint, this view identifies the table that the foreign key references. For a unique or primary key constraint, this view simply identifies the table the constraint belongs to. Check constraints and not-null constraints are not included in this view. </P ><DIV CLASS="TABLE" ><A NAME="AEN26593" ></A ><P ><B >Table 30-9. <TT CLASS="LITERAL" >constraint_table_usage</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" >table_catalog</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD > Name of the database that contains the table that is used by some constraint (always the current database) </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >table_schema</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD > Name of the schema that contains the table that is used by some constraint </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >table_name</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the table that is used by some constraint</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >constraint_catalog</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the database that contains the constraint (always the current database)</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >constraint_schema</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the schema that contains the constraint</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >constraint_name</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the constraint</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-constraint-column-usage.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-data-type-privileges.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><TT CLASS="LITERAL" >constraint_column_usage</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" >data_type_privileges</TT ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >