Creating a user-defined type (UDT)
User-Defined Types (UDTs) can be used to attach multiple data fields to a column.
User-defined types (UDTs) can attach multiple data fields, each named and typed, to a single column. The fields used to create a UDT may be any valid data type, including collections and other existing UDTs. Once created, UDTs may be used to define a column in a table.