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17th chunk of `doc/src/sgml/information_schema.sgml`
ead8b66ed8871545849cc74ab2110a331970fae1bce605f90000000100000fa0
 </para>

  <table>
   <title><structname>column_udt_usage</structname> Columns</title>
   <tgroup cols="1">
    <thead>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       Column Type
      </para>
      <para>
       Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>udt_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database that the column data type (the underlying
       type of the domain, if applicable) is defined in (always the
       current database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>udt_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema that the column data type (the underlying
       type of the domain, if applicable) is defined in
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>udt_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the column data type (the underlying type of the
       domain, if applicable)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>table_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database containing the table (always the current database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>table_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema containing the table
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>table_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the table
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>column_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the column
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </sect1>

 <sect1 id="infoschema-columns">
  <title><literal>columns</literal></title>

  <para>
   The view <literal>columns</literal> contains information about all
   table columns (or view columns) in the database.  System columns
   (<literal>ctid</literal>, etc.) are not included.  Only those columns are
   shown that the current user has access to (by way of being the
   owner or having some privilege).
  </para>

  <table>
   <title><structname>columns</structname> Columns</title>
   <tgroup cols="1">
    <thead>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       Column Type
      </para>
      <para>
       Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>table_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database containing the table (always the current database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>table_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema containing the table
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>table_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the table
      </para></entry>
     </row>
Title: Information Schema Views for Column UDT Usage and Columns
Summary
This section describes two Information Schema views: column_udt_usage, which identifies columns using data types owned by a currently enabled role, and columns, which contains information about all table columns in the database, including their catalog, schema, and table names, with details on the columns and access restrictions based on user privileges.