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><A
NAME="INFOSCHEMA-DOMAINS"
>34.22. <TT
CLASS="LITERAL"
>domains</TT
></A
></H1
><P
>   The view <TT
CLASS="LITERAL"
>domains</TT
> 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"
><A
NAME="AEN48289"
></A
><P
><B
>Table 34-20. <TT
CLASS="LITERAL"
>domains</TT
> Columns</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Data Type</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="LITERAL"
>domain_catalog</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the database that contains the domain (always the current database)</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>domain_schema</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the schema that contains the domain</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>domain_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the domain</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>data_type</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>       Data type of the domain, if it is a built-in type, or
       <TT
CLASS="LITERAL"
>ARRAY</TT
> if it is some array (in that case, see
       the view <TT
CLASS="LITERAL"
>element_types</TT
>), else
       <TT
CLASS="LITERAL"
>USER-DEFINED</TT
> (in that case, the type is
       identified in <TT
CLASS="LITERAL"
>udt_name</TT
> and associated
       columns).
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>character_maximum_length</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></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
><TT
CLASS="LITERAL"
>character_octet_length</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></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
><TT
CLASS="LITERAL"
>character_set_catalog</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>character_set_schema</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>character_set_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>collation_catalog</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></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
><TT
CLASS="LITERAL"
>collation_schema</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></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
><TT
CLASS="LITERAL"
>collation_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></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
><TT
CLASS="LITERAL"
>numeric_precision</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></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
       <TT
CLASS="LITERAL"
>numeric_precision_radix</TT
>.  For all other data
       types, this column is null.
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>numeric_precision_radix</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></TD
><TD
>       If the domain has a numeric type, this column indicates in
       which base the values in the columns
       <TT
CLASS="LITERAL"
>numeric_precision</TT
> and
       <TT
CLASS="LITERAL"
>numeric_scale</TT
> are expressed.  The value is
       either 2 or 10.  For all other data types, this column is null.
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>numeric_scale</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></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
       <TT
CLASS="LITERAL"
>numeric_precision_radix</TT
>.  For all other data
       types, this column is null.
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>datetime_precision</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></TD
><TD
>       If <TT
CLASS="LITERAL"
>data_type</TT
> 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
><TT
CLASS="LITERAL"
>interval_type</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>       If <TT
CLASS="LITERAL"
>data_type</TT
> identifies an interval type,
       this column contains the specification which fields the
       intervals include for this domain, e.g., <TT
CLASS="LITERAL"
>YEAR TO
       MONTH</TT
>, <TT
CLASS="LITERAL"
>DAY TO SECOND</TT
>, 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
><TT
CLASS="LITERAL"
>interval_precision</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></TD
><TD
>       Applies to a feature not available
       in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
       (see <TT
CLASS="LITERAL"
>datetime_precision</TT
> for the fractional
       seconds precision of interval type domains)
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>domain_default</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>Default expression of the domain</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>udt_catalog</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the database that the domain data type is defined in (always the current database)</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>udt_schema</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the schema that the domain data type is defined in</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>udt_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the domain data type</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>scope_catalog</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>scope_schema</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>scope_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>maximum_cardinality</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></TD
><TD
>Always null, because arrays always have unlimited maximum cardinality in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>dtd_identifier</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></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
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