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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>

  2. <!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>36.23. 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 V1.79.1" /><link rel="prev" href="infoschema-domain-udt-usage.html" title="36.22. domain_udt_usage" /><link rel="next" href="infoschema-element-types.html" title="36.24. 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">36.23. <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="36.22. domain_udt_usage">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="information-schema.html" title="Chapter 36. The Information Schema">Up</a></td><th width="60%" align="center">Chapter 36. The Information Schema</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="infoschema-element-types.html" title="36.24. 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">36.23. <code class="literal">domains</code></h2></div></div></div><p>

  3.    The view <code class="literal">domains</code> contains all domains defined in the

  4.    current database.  Only those domains are shown that the current user has

  5.    access to (by way of being the owner or having some privilege).

  6.   </p><div class="table" id="id-1.7.6.27.3"><p class="title"><strong>Table 36.21. <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>

  7.        Data type of the domain, if it is a built-in type, or

  8.        <code class="literal">ARRAY</code> if it is some array (in that case, see

  9.        the view <code class="literal">element_types</code>), else

  10.        <code class="literal">USER-DEFINED</code> (in that case, the type is

  11.        identified in <code class="literal">udt_name</code> and associated

  12.        columns).

  13.       </td></tr><tr><td><code class="literal">character_maximum_length</code></td><td><code class="type">cardinal_number</code></td><td>

  14.        If the domain has a character or bit string type, the declared

  15.        maximum length; null for all other data types or if no maximum

  16.        length was declared.

  17.       </td></tr><tr><td><code class="literal">character_octet_length</code></td><td><code class="type">cardinal_number</code></td><td>

  18.        If the domain has a character type, the maximum possible length

  19.        in octets (bytes) of a datum; null for all other data types.

  20.        The maximum octet length depends on the declared character

  21.        maximum length (see above) and the server encoding.

  22.       </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>

  23.        Name of the database containing the collation of the domain

  24.        (always the current database), null if default or the data type

  25.        of the domain is not collatable

  26.       </td></tr><tr><td><code class="literal">collation_schema</code></td><td><code class="type">sql_identifier</code></td><td>

  27.        Name of the schema containing the collation of the domain, null

  28.        if default or the data type of the domain is not collatable

  29.       </td></tr><tr><td><code class="literal">collation_name</code></td><td><code class="type">sql_identifier</code></td><td>

  30.        Name of the collation of the domain, null if default or the

  31.        data type of the domain is not collatable

  32.       </td></tr><tr><td><code class="literal">numeric_precision</code></td><td><code class="type">cardinal_number</code></td><td>

  33.        If the domain has a numeric type, this column contains the

  34.        (declared or implicit) precision of the type for this domain.

  35.        The precision indicates the number of significant digits.  It

  36.        can be expressed in decimal (base 10) or binary (base 2) terms,

  37.        as specified in the column

  38.        <code class="literal">numeric_precision_radix</code>.  For all other data

  39.        types, this column is null.

  40.       </td></tr><tr><td><code class="literal">numeric_precision_radix</code></td><td><code class="type">cardinal_number</code></td><td>

  41.        If the domain has a numeric type, this column indicates in

  42.        which base the values in the columns

  43.        <code class="literal">numeric_precision</code> and

  44.        <code class="literal">numeric_scale</code> are expressed.  The value is

  45.        either 2 or 10.  For all other data types, this column is null.

  46.       </td></tr><tr><td><code class="literal">numeric_scale</code></td><td><code class="type">cardinal_number</code></td><td>

  47.        If the domain has an exact numeric type, this column contains

  48.        the (declared or implicit) scale of the type for this domain.

  49.        The scale indicates the number of significant digits to the

  50.        right of the decimal point.  It can be expressed in decimal

  51.        (base 10) or binary (base 2) terms, as specified in the column

  52.        <code class="literal">numeric_precision_radix</code>.  For all other data

  53.        types, this column is null.

  54.       </td></tr><tr><td><code class="literal">datetime_precision</code></td><td><code class="type">cardinal_number</code></td><td>

  55.        If <code class="literal">data_type</code> identifies a date, time,

  56.        timestamp, or interval type, this column contains the (declared

  57.        or implicit) fractional seconds precision of the type for this

  58.        domain, that is, the number of decimal digits maintained

  59.        following the decimal point in the seconds value.  For all

  60.        other data types, this column is null.

  61.       </td></tr><tr><td><code class="literal">interval_type</code></td><td><code class="type">character_data</code></td><td>

  62.        If <code class="literal">data_type</code> identifies an interval type,

  63.        this column contains the specification which fields the

  64.        intervals include for this domain, e.g., <code class="literal">YEAR TO

  65.        MONTH</code>, <code class="literal">DAY TO SECOND</code>, etc.  If no

  66.        field restrictions were specified (that is, the interval

  67.        accepts all fields), and for all other data types, this field

  68.        is null.

  69.       </td></tr><tr><td><code class="literal">interval_precision</code></td><td><code class="type">cardinal_number</code></td><td>

  70.        Applies to a feature not available

  71.        in <span class="productname">PostgreSQL</span>

  72.        (see <code class="literal">datetime_precision</code> for the fractional

  73.        seconds precision of interval type domains)

  74.       </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>

  75.        An identifier of the data type descriptor of the domain, unique

  76.        among the data type descriptors pertaining to the domain (which

  77.        is trivial, because a domain only contains one data type

  78.        descriptor).  This is mainly useful for joining with other

  79.        instances of such identifiers.  (The specific format of the

  80.        identifier is not defined and not guaranteed to remain the same

  81.        in future versions.)

  82.       </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">36.22. <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"> 36.24. <code class="literal">element_types</code></td></tr></table></div></body></html>
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