TYPE_NAME (Transact-SQL)

Returns the unqualified type name of a specified type ID.

Topic link iconTransact-SQL Syntax Conventions

TYPE_NAME (type_id )


Is the ID of the type that will be used. type_id is an int, and it can refer to a type in any schema that the caller has permission to access.

Returns NULL on error or if a caller does not have permission to view the object.

In SQL Server, a user can only view the metadata of securables that the user owns or on which the user has been granted permission. This means that metadata-emitting, built-in functions such as TYPE_NAME may return NULL if the user does not have any permission on the object. For more information, see Metadata Visibility Configuration and Troubleshooting Metadata Visibility.

TYPE_NAME will return NULL when type_id is not valid or when the caller does not have sufficient permission to reference the type.

TYPE_NAME works for system data types and also for user-defined data types. The type can be contained in any schema, but an unqualified type name is always returned. This means the name does not have the schema. prefix.

System functions can be used in the select list, in the WHERE clause, and anywhere an expression is allowed. For more information, see Expressions (Transact-SQL) and WHERE (Transact-SQL).

The following example returns the object name, column name, and type name for each column in the Vendor table of the AdventureWorks database.

USE AdventureWorks;
SELECT o.name AS obj_name, c.name AS col_name,
       TYPE_NAME(c.user_type_id) AS type_name
FROM sys.objects AS o 
JOIN sys.columns AS c  ON o.object_id = c.object_id
WHERE o.name = 'Vendor'
ORDER BY col_name;

Here is the result set.

obj_name  col_name                 type_name
--------- -----------------------  -------------------
Vendor    AccountNumber            AccountNumber
Vendor    ActiveFlag               Flag
Vendor    CreditRating             tinyint
Vendor    ModifiedDate             datetime
Vendor    Name                     Name
Vendor    PreferredVendorStatus    Flag
Vendor    PurchasingWebServiceURL  nvarchar
Vendor    VendorID                 int
(8 row(s) affected)