<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >domains</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="domain_udt_usage" HREF="infoschema-domain-udt-usage.html"><LINK REL="NEXT" TITLE="element_types" HREF="infoschema-element-types.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-domain-udt-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-element-types.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="INFOSCHEMA-DOMAINS" >30.15. <TT CLASS="LITERAL" >domains</TT ></A ></H1 ><P > The view <TT CLASS="LITERAL" >domains</TT > contains all domains defined in the current database. </P ><DIV CLASS="TABLE" ><A NAME="AEN26811" ></A ><P ><B >Table 30-13. <TT CLASS="LITERAL" >domains</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" >domain_catalog</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the database that contains the domain (always the current database)</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >domain_schema</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the schema that contains the domain</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >domain_name</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the domain</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >data_type</TT ></TD ><TD ><TT CLASS="TYPE" >character_data</TT ></TD ><TD > Data type of the domain, if it is a built-in type, or <TT CLASS="LITERAL" >ARRAY</TT > if it is some array (in that case, see the view <TT CLASS="LITERAL" >element_types</TT >), else <TT CLASS="LITERAL" >USER-DEFINED</TT > (in that case, the type is identified in <TT CLASS="LITERAL" >udt_name</TT > and associated columns). </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >character_maximum_length</TT ></TD ><TD ><TT CLASS="TYPE" >cardinal_number</TT ></TD ><TD > If the domain has a character or bit string type, the declared maximum length; null for all other data types or if no maximum length was declared. </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >character_octet_length</TT ></TD ><TD ><TT CLASS="TYPE" >cardinal_number</TT ></TD ><TD > If the domain has a character type, the maximum possible length in octets (bytes) of a datum (this should not be of concern to <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > users); null for all other data types. </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >character_set_catalog</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Applies to a feature not available in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >character_set_schema</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Applies to a feature not available in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >character_set_name</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Applies to a feature not available in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >collation_catalog</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Applies to a feature not available in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >collation_schema</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Applies to a feature not available in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >collation_name</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Applies to a feature not available in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >numeric_precision</TT ></TD ><TD ><TT CLASS="TYPE" >cardinal_number</TT ></TD ><TD > If the domain has a numeric type, this column contains the (declared or implicit) precision of the type for this column. The precision indicates the number of significant digits. It may be expressed in decimal (base 10) or binary (base 2) terms, as specified in the column <TT CLASS="LITERAL" >numeric_precision_radix</TT >. For all other data types, this column is null. </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >numeric_precision_radix</TT ></TD ><TD ><TT CLASS="TYPE" >cardinal_number</TT ></TD ><TD > If the domain has a numeric type, this column indicates in which base the values in the columns <TT CLASS="LITERAL" >numeric_precision</TT > and <TT CLASS="LITERAL" >numeric_scale</TT > are expressed. The value is either 2 or 10. For all other data types, this column is null. </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >numeric_scale</TT ></TD ><TD ><TT CLASS="TYPE" >cardinal_number</TT ></TD ><TD > If the domain has an exact numeric type, this column contains the (declared or implicit) scale of the type for this column. The scale indicates the number of significant digits to the right of the decimal point. It may be expressed in decimal (base 10) or binary (base 2) terms, as specified in the column <TT CLASS="LITERAL" >numeric_precision_radix</TT >. For all other data types, this column is null. </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >datetime_precision</TT ></TD ><TD ><TT CLASS="TYPE" >cardinal_number</TT ></TD ><TD > If the domain has a date, time, or interval type, the declared precision; null for all other data types or if no precision was declared. </TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >interval_type</TT ></TD ><TD ><TT CLASS="TYPE" >character_data</TT ></TD ><TD >Not yet implemented</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >interval_precision</TT ></TD ><TD ><TT CLASS="TYPE" >character_data</TT ></TD ><TD >Not yet implemented</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >domain_default</TT ></TD ><TD ><TT CLASS="TYPE" >character_data</TT ></TD ><TD >Default expression of the domain</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >udt_catalog</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the database that the domain data type is defined in (always the current database)</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >udt_schema</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the schema that the domain data type is defined in</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >udt_name</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Name of the domain data type</TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >scope_catalog</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Applies to a feature not available in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >scope_schema</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Applies to a feature not available in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >scope_name</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD >Applies to a feature not available in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >maximum_cardinality</TT ></TD ><TD ><TT CLASS="TYPE" >cardinal_number</TT ></TD ><TD >Always null, because arrays always have unlimited maximum cardinality in <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ><TR ><TD ><TT CLASS="LITERAL" >dtd_identifier</TT ></TD ><TD ><TT CLASS="TYPE" >sql_identifier</TT ></TD ><TD > An identifier of the data type descriptor of the domain, unique among the data type descriptors pertaining to the domain (which is trivial, because a domain only contains one data type descriptor). This is mainly useful for joining with other instances of such identifiers. (The specific format of the identifier is not defined and not guaranteed to remain the same in future versions.) </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-domain-udt-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-element-types.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><TT CLASS="LITERAL" >domain_udt_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" >element_types</TT ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >