Working with User-Defined Types in SQL Server
You can access user-defined type (UDT) functionality in Microsoft SQL Server from the Transact-SQL language by using regular query syntax. UDTs can be used in the definition of database objects, as variables in Transact-SQL batches, in functions and stored procedures, and as arguments in functions and stored procedures.
Defining UDT Tables and Columns
Describes how to use Transact-SQL to create a UDT column in a table.
Manipulating UDT Data
Describes how to use Transact-SQL to work with UDT data in SQL Server.