DOMAINS (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns one row for each alias data type that can be accessed by the current user in the current database.
To retrieve information from these views, specify the fully qualified name of INFORMATION_SCHEMA.view_name.
| Column name | Data type | Description |
|---|---|---|
| DOMAIN_CATALOG | nvarchar(128) | Database in which the alias data type exists. |
| DOMAIN_SCHEMA | nvarchar(128) | Name of the schema that contains the alias data type. Important: Don't use INFORMATION_SCHEMA views to determine the schema of a data type. The only reliable way to find the schema of a type is to use the TYPEPROPERTY function. |
| DOMAIN_NAME | sysname | Alias data type. |
| DATA_TYPE | sysname | System-supplied data type. |
| CHARACTER_MAXIMUM_LENGTH | int | Maximum length, in characters, for binary data, character data, or text and image data. -1 for xml and large-value type data. Otherwise, NULL is returned. For more information, see Data Types (Transact-SQL). |
| CHARACTER_OCTET_LENGTH | int | Maximum length, in bytes, for binary data, character data, or text and image data. -1 for xml and large-value type data. Otherwise, NULL is returned. |
| COLLATION_CATALOG | varchar(6) | Always returns NULL. |
| COLLATION_SCHEMA | varchar(3) | Always returns NULL. |
| COLLATION_NAME | nvarchar(128) | Returns the unique name for the sort order if the column is character data or text data type. Otherwise, NULL is returned. |
| CHARACTER_SET_CATALOG | varchar(6) | Returns master. This indicates the database in which the character set is located, if the column is character data or text data type. Otherwise, NULL is returned. |
| CHARACTER_SET_SCHEMA | varchar(3) | Always returns NULL. |
| CHARACTER_SET_NAME | nvarchar(128) | Returns the unique name for the character set if this column is character data or text data type. Otherwise, NULL is returned. |
| NUMERIC_PRECISION | tinyint | Precision of approximate numeric data, exact numeric data, integer data, or monetary data. Otherwise, NULL is returned. |
| NUMERIC_PRECISION_RADIX | smallint | Precision radix of approximate numeric data, exact numeric data, integer data, or monetary data. Otherwise, NULL is returned. |
| NUMERIC_SCALE | tinyint | Scale of approximate numeric data, exact numeric data, integer data, or monetary data. Otherwise, NULL is returned. |
| DATETIME_PRECISION | smallint | Subtype code for datetime and ISO interval data type. For other data types, this column returns a NULL. |
| DOMAIN_DEFAULT | nvarchar(4000) | Actual text of the definition Transact-SQL statement. |
See Also
System Views (Transact-SQL)
Information Schema Views (Transact-SQL)
sys.syscharsets (Transact-SQL)
sys.sql_modules (Transact-SQL)
sys.configurations (Transact-SQL)
sys.types (Transact-SQL)