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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>37.6. attributes</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-applicable-roles.html" title="37.5. applicable_roles" /><link rel="next" href="infoschema-character-sets.html" title="37.7. character_sets" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">37.6. <code xmlns="http://www.w3.org/1999/xhtml" class="literal">attributes</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="infoschema-applicable-roles.html" title="37.5. applicable_roles">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 14.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="infoschema-character-sets.html" title="37.7. character_sets">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="INFOSCHEMA-ATTRIBUTES"><div class="titlepage"><div><div><h2 class="title" style="clear: both">37.6. <code class="literal">attributes</code></h2></div></div></div><p>
The view <code class="literal">attributes</code> contains information about
the attributes of composite data types defined in the database.
(Note that the view does not give information about table columns,
which are sometimes called attributes in PostgreSQL contexts.)
Only those attributes are shown that the current user has access to (by way
of being the owner of or having some privilege on the type).
</p><div class="table" id="id-1.7.6.10.3"><p class="title"><strong>Table 37.4. <code class="structname">attributes</code> Columns</strong></p><div class="table-contents"><table class="table" summary="attributes 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">udt_catalog</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the database containing the data type (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 containing the data type
</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 data type
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">attribute_name</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the attribute
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">ordinal_position</code> <code class="type">cardinal_number</code>
</p>
<p>
Ordinal position of the attribute within the data type (count starts at 1)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">attribute_default</code> <code class="type">character_data</code>
</p>
<p>
Default expression of the attribute
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">is_nullable</code> <code class="type">yes_or_no</code>
</p>
<p>
<code class="literal">YES</code> if the attribute is possibly nullable,
<code class="literal">NO</code> if it is known not nullable.
</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 attribute, 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">attribute_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 <code class="literal">data_type</code> identifies 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 <code class="literal">data_type</code> identifies 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 attribute
(always the current database), null if default or the data type
of the attribute 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 attribute,
null if default or the data type of the attribute 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 attribute, null if default or the
data type of the attribute 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 <code class="literal">data_type</code> identifies a numeric type, this
column contains the (declared or implicit) precision of the
type for this attribute. 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 <code class="literal">data_type</code> identifies 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 <code class="literal">data_type</code> identifies an exact numeric
type, this column contains the (declared or implicit) scale of
the type for this attribute. 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
attribute, 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 attribute, 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 attributes)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">attribute_udt_catalog</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the database that the attribute 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">attribute_udt_schema</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the schema that the attribute data type is defined in
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">attribute_udt_name</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the attribute 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 column, unique
among the data type descriptors pertaining to the table. 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><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">is_derived_reference_attribute</code> <code class="type">yes_or_no</code>
</p>
<p>
Applies to a feature not available in <span class="productname">PostgreSQL</span>
</p></td></tr></tbody></table></div></div><br class="table-break" /><p>
See also under <a class="xref" href="infoschema-columns.html" title="37.17. columns">Section 37.17</a>, a similarly
structured view, for further information on some of the columns.
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