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<!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>37.22. 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="37.21. domain_udt_usage" /><link rel="next" href="infoschema-element-types.html" title="37.23. element_types" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">37.22. <code xmlns="http://www.w3.org/1999/xhtml" class="literal">domains</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="infoschema-domain-udt-usage.html" title="37.21. 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 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="infoschema-element-types.html" title="37.23. element_types">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="INFOSCHEMA-DOMAINS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">37.22. <code class="literal">domains</code></h2></div></div></div><p>
The view <code class="literal">domains</code> contains all domains 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-1.7.6.26.3"><p class="title"><strong>Table 37.20. <code class="literal">domains</code> Columns</strong></p><div class="table-contents"><table class="table" summary="domains Columns" border="1"><colgroup><col /><col /><col /></colgroup><thead><tr><th>Name</th><th>Data Type</th><th>Description</th></tr></thead><tbody><tr><td><code class="literal">domain_catalog</code></td><td><code class="type">sql_identifier</code></td><td>Name of the database that contains the domain (always the current database)</td></tr><tr><td><code class="literal">domain_schema</code></td><td><code class="type">sql_identifier</code></td><td>Name of the schema that contains the domain</td></tr><tr><td><code class="literal">domain_name</code></td><td><code class="type">sql_identifier</code></td><td>Name of the domain</td></tr><tr><td><code class="literal">data_type</code></td><td><code class="type">character_data</code></td><td>
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).
</td></tr><tr><td><code class="literal">character_maximum_length</code></td><td><code class="type">cardinal_number</code></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><code class="literal">character_octet_length</code></td><td><code class="type">cardinal_number</code></td><td>
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.
</td></tr><tr><td><code class="literal">character_set_catalog</code></td><td><code class="type">sql_identifier</code></td><td>Applies to a feature not available in <span class="productname">PostgreSQL</span></td></tr><tr><td><code class="literal">character_set_schema</code></td><td><code class="type">sql_identifier</code></td><td>Applies to a feature not available in <span class="productname">PostgreSQL</span></td></tr><tr><td><code class="literal">character_set_name</code></td><td><code class="type">sql_identifier</code></td><td>Applies to a feature not available in <span class="productname">PostgreSQL</span></td></tr><tr><td><code class="literal">collation_catalog</code></td><td><code class="type">sql_identifier</code></td><td>
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
</td></tr><tr><td><code class="literal">collation_schema</code></td><td><code class="type">sql_identifier</code></td><td>
Name of the schema containing the collation of the domain, null
if default or the data type of the domain is not collatable
</td></tr><tr><td><code class="literal">collation_name</code></td><td><code class="type">sql_identifier</code></td><td>
Name of the collation of the domain, null if default or the
data type of the domain is not collatable
</td></tr><tr><td><code class="literal">numeric_precision</code></td><td><code class="type">cardinal_number</code></td><td>
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.
</td></tr><tr><td><code class="literal">numeric_precision_radix</code></td><td><code class="type">cardinal_number</code></td><td>
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.
</td></tr><tr><td><code class="literal">numeric_scale</code></td><td><code class="type">cardinal_number</code></td><td>
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.
</td></tr><tr><td><code class="literal">datetime_precision</code></td><td><code class="type">cardinal_number</code></td><td>
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.
</td></tr><tr><td><code class="literal">interval_type</code></td><td><code class="type">character_data</code></td><td>
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.
</td></tr><tr><td><code class="literal">interval_precision</code></td><td><code class="type">cardinal_number</code></td><td>
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)
</td></tr><tr><td><code class="literal">domain_default</code></td><td><code class="type">character_data</code></td><td>Default expression of the domain</td></tr><tr><td><code class="literal">udt_catalog</code></td><td><code class="type">sql_identifier</code></td><td>Name of the database that the domain data type is defined in (always the current database)</td></tr><tr><td><code class="literal">udt_schema</code></td><td><code class="type">sql_identifier</code></td><td>Name of the schema that the domain data type is defined in</td></tr><tr><td><code class="literal">udt_name</code></td><td><code class="type">sql_identifier</code></td><td>Name of the domain data type</td></tr><tr><td><code class="literal">scope_catalog</code></td><td><code class="type">sql_identifier</code></td><td>Applies to a feature not available in <span class="productname">PostgreSQL</span></td></tr><tr><td><code class="literal">scope_schema</code></td><td><code class="type">sql_identifier</code></td><td>Applies to a feature not available in <span class="productname">PostgreSQL</span></td></tr><tr><td><code class="literal">scope_name</code></td><td><code class="type">sql_identifier</code></td><td>Applies to a feature not available in <span class="productname">PostgreSQL</span></td></tr><tr><td><code class="literal">maximum_cardinality</code></td><td><code class="type">cardinal_number</code></td><td>Always null, because arrays always have unlimited maximum cardinality in <span class="productname">PostgreSQL</span></td></tr><tr><td><code class="literal">dtd_identifier</code></td><td><code class="type">sql_identifier</code></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><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">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="information-schema.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="infoschema-element-types.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">37.21. <code class="literal">domain_udt_usage</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 37.23. <code class="literal">element_types</code></td></tr></table></div></body></html>
