PostgreSQL 7.4 Documentation
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# 32.15. domains

The view domains contains all domains defined in the current database.

Table 32-13. domains Columns

Name | Data Type | Description
--- | --- | ---
domain_catalog | `sql_identifier` | Name of the database that contains the domain (always the current database)
domain_schema | `sql_identifier` | Name of the schema that contains the domain
domain_name | `sql_identifier` | Name of the domain
data_type | `character_data` | Data type of the domain, if it is a built-in type, or ARRAY if it is some array (in that case, see the view element_types), else USER-DEFINED (in that case, the type is identified in udt_name and associated columns).
character_maximum_length | `cardinal_number` | 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.
character_octet_length | `cardinal_number` | If the domain has a character type, the maximum possible length in octets (bytes) of a datum (this should not be of concern to PostgreSQL users); null for all other data types.
character_set_catalog | `sql_identifier` | Applies to a feature not available in PostgreSQL
character_set_schema | `sql_identifier` | Applies to a feature not available in PostgreSQL
character_set_name | `sql_identifier` | Applies to a feature not available in PostgreSQL
collation_catalog | `sql_identifier` | Applies to a feature not available in PostgreSQL
collation_schema | `sql_identifier` | Applies to a feature not available in PostgreSQL
collation_name | `sql_identifier` | Applies to a feature not available in PostgreSQL
numeric_precision | `cardinal_number` | If the domain has a numeric type, this column contains the (declared or implicit) precision of the type for this column. The precision indicates the number of significant digits. It may be expressed in decimal (base 10) or binary (base 2) terms, as specified in the column numeric_precision_radix. For all other data types, this column is null.
numeric_precision_radix | `cardinal_number` | If the domain has a numeric type, this column indicates in which base the values in the columns numeric_precision and numeric_scale are expressed. The value is either 2 or 10. For all other data types, this column is null.

numeric_scale

`cardinal_number`

If the domain has an exact numeric type, this column contains the (declared or implicit) scale of the type for this column. The scale indicates the number of significant digits to the right of the decimal point. It may be expressed in decimal (base 10) or binary (base 2) terms, as specified in the column numeric_precision_radix. For all other data types, this column is null.

datetime_precision | `cardinal_number` | If the domain has a date, time, or interval type, the declared precision; null for all other data types or if no precision was declared.
interval_type | `character_data` | Not yet implemented
interval_precision | `character_data` | Not yet implemented
domain_default | `character_data` | Default expression of the domain
udt_catalog | `sql_identifier` | Name of the database that the domain data type is defined in (always the current database)
udt_schema | `sql_identifier` | Name of the schema that the domain data type is defined in
udt_name | `sql_identifier` | Name of the domain data type
scope_catalog | `sql_identifier` | Applies to a feature not available in PostgreSQL
scope_schema | `sql_identifier` | Applies to a feature not available in PostgreSQL
scope_name | `sql_identifier` | Applies to a feature not available in PostgreSQL
maximum_cardinality | `cardinal_number` | Always null, because arrays always have unlimited maximum cardinality in PostgreSQL

dtd_identifier

`sql_identifier`

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.)

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