• Article

COLUMN_DOMAIN_USAGE (Transact-SQL)

Returns one row for each column in the current database that has an alias data type. This information schema view returns information about the objects to which the current user has permissions.

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 schema that contains the alias data type.

Important noteImportant
Do not 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.

TABLE_CATALOG

nvarchar(128)

Table qualifier.

TABLE_SCHEMA

nvarchar(128)

Table owner.

Important noteImportant
Do not use INFORMATION_SCHEMA views to determine the schema of an object. The only reliable way to find the schema of an object is to query the sys.objects catalog view or use the OBJECT_SCHEMA_NAME function.

TABLE_NAME

sysname

Table in which the alias data type is used.

COLUMN_NAME

sysname

Column using the alias data type.

Examples

The following example returns information for each table or view in the Sales schema that has a column defined using an alias data type.

USE AdventureWorks;
GO
SELECT DOMAIN_CATALOG, DOMAIN_SCHEMA, DOMAIN_NAME as Alias_Name, COLUMN_NAME, 
       TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME AS Table_or_View_Name
FROM INFORMATION_SCHEMA.COLUMN_DOMAIN_USAGE AS cdu
INNER JOIN sys.objects AS o ON cdu.TABLE_NAME = o.name 
    AND OBJECT_SCHEMA_NAME(o.object_id) = N'Sales';