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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>37.23. domains</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="infoschema-domain-udt-usage.html" title="37.22. domain_udt_usage" /><link rel="next" href="infoschema-element-types.html" title="37.24. element_types" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">37.23. <code class="literal">domains</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="infoschema-domain-udt-usage.html" title="37.22. domain_udt_usage">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="information-schema.html" title="Chapter 37. The Information Schema">Up</a></td><th width="60%" align="center">Chapter 37. The Information Schema</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="infoschema-element-types.html" title="37.24. element_types">Next</a></td></tr></table><hr /></div><div class="sect1" id="INFOSCHEMA-DOMAINS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">37.23. <code class="literal">domains</code></h2></div></div></div><p>
   The view <code class="literal">domains</code> contains all
   <a class="glossterm" href="glossary.html#GLOSSARY-DOMAIN"><em class="glossterm"><a class="glossterm" href="glossary.html#GLOSSARY-DOMAIN" title="Domain">domains</a></em></a> defined in the
   current database.  Only those domains are shown that the current user has
   access to (by way of being the owner or having some privilege).
  </p><div class="table" id="id-1.7.6.27.3"><p class="title"><strong>Table 37.21. <code class="structname">domains</code> Columns</strong></p><div class="table-contents"><table class="table" summary="domains Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
       Column Type
      </p>
      <p>
       Description
      </p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">domain_catalog</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Name of the database that contains the domain (always the current database)
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">domain_schema</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Name of the schema that contains the domain
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">domain_name</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Name of the domain
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">data_type</code> <code class="type">character_data</code>
      </p>
      <p>
       Data type of the domain, if it is a built-in type, or
       <code class="literal">ARRAY</code> if it is some array (in that case, see
       the view <code class="literal">element_types</code>), else
       <code class="literal">USER-DEFINED</code> (in that case, the type is
       identified in <code class="literal">udt_name</code> and associated
       columns).
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">character_maximum_length</code> <code class="type">cardinal_number</code>
      </p>
      <p>
       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.
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">character_octet_length</code> <code class="type">cardinal_number</code>
      </p>
      <p>
       If the domain has a character type, the maximum possible length
       in octets (bytes) of a datum; null for all other data types.
       The maximum octet length depends on the declared character
       maximum length (see above) and the server encoding.
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">character_set_catalog</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Applies to a feature not available in <span class="productname">PostgreSQL</span>
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">character_set_schema</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Applies to a feature not available in <span class="productname">PostgreSQL</span>
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">character_set_name</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Applies to a feature not available in <span class="productname">PostgreSQL</span>
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">collation_catalog</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Name of the database containing the collation of the domain
       (always the current database), null if default or the data type
       of the domain is not collatable
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">collation_schema</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Name of the schema containing the collation of the domain, null
       if default or the data type of the domain is not collatable
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">collation_name</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Name of the collation of the domain, null if default or the
       data type of the domain is not collatable
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">numeric_precision</code> <code class="type">cardinal_number</code>
      </p>
      <p>
       If the domain has a numeric type, this column contains the
       (declared or implicit) precision of the type for this domain.
       The precision indicates the number of significant digits.  It
       can be expressed in decimal (base 10) or binary (base 2) terms,
       as specified in the column
       <code class="literal">numeric_precision_radix</code>.  For all other data
       types, this column is null.
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">numeric_precision_radix</code> <code class="type">cardinal_number</code>
      </p>
      <p>
       If the domain has a numeric type, this column indicates in
       which base the values in the columns
       <code class="literal">numeric_precision</code> and
       <code class="literal">numeric_scale</code> are expressed.  The value is
       either 2 or 10.  For all other data types, this column is null.
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">numeric_scale</code> <code class="type">cardinal_number</code>
      </p>
      <p>
       If the domain has an exact numeric type, this column contains
       the (declared or implicit) scale of the type for this domain.
       The scale indicates the number of significant digits to the
       right of the decimal point.  It can be expressed in decimal
       (base 10) or binary (base 2) terms, as specified in the column
       <code class="literal">numeric_precision_radix</code>.  For all other data
       types, this column is null.
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">datetime_precision</code> <code class="type">cardinal_number</code>
      </p>
      <p>
       If <code class="literal">data_type</code> identifies a date, time,
       timestamp, or interval type, this column contains the (declared
       or implicit) fractional seconds precision of the type for this
       domain, that is, the number of decimal digits maintained
       following the decimal point in the seconds value.  For all
       other data types, this column is null.
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">interval_type</code> <code class="type">character_data</code>
      </p>
      <p>
       If <code class="literal">data_type</code> identifies an interval type,
       this column contains the specification which fields the
       intervals include for this domain, e.g., <code class="literal">YEAR TO
       MONTH</code>, <code class="literal">DAY TO SECOND</code>, etc.  If no
       field restrictions were specified (that is, the interval
       accepts all fields), and for all other data types, this field
       is null.
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">interval_precision</code> <code class="type">cardinal_number</code>
      </p>
      <p>
       Applies to a feature not available
       in <span class="productname">PostgreSQL</span>
       (see <code class="literal">datetime_precision</code> for the fractional
       seconds precision of interval type domains)
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">domain_default</code> <code class="type">character_data</code>
      </p>
      <p>
       Default expression of the domain
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">udt_catalog</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Name of the database that the domain data type is defined in (always the current database)
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">udt_schema</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Name of the schema that the domain data type is defined in
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">udt_name</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Name of the domain data type
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">scope_catalog</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Applies to a feature not available in <span class="productname">PostgreSQL</span>
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">scope_schema</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Applies to a feature not available in <span class="productname">PostgreSQL</span>
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">scope_name</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       Applies to a feature not available in <span class="productname">PostgreSQL</span>
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">maximum_cardinality</code> <code class="type">cardinal_number</code>
      </p>
      <p>
       Always null, because arrays always have unlimited maximum cardinality in <span class="productname">PostgreSQL</span>
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">dtd_identifier</code> <code class="type">sql_identifier</code>
      </p>
      <p>
       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.)
      </p></td></tr></tbody></table></div></div><br class="table-break" /></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="infoschema-domain-udt-usage.html" title="37.22. domain_udt_usage">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="information-schema.html" title="Chapter 37. The Information Schema">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="infoschema-element-types.html" title="37.24. element_types">Next</a></td></tr><tr><td width="40%" align="left" valign="top">37.22. <code class="literal">domain_udt_usage</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 37.24. <code class="literal">element_types</code></td></tr></table></div></body></html>