Continuing on with his series on ADTs, Yakov Shlafman takes a look at working with schema changes when your ADT is on a column used as a primary or foreign key.
In SQL Server 2005 there is the concept of alias data types, which are similar to user-defined data types in SQL Server 2000. Yakov Shlafman brings us the first part of a series looking at these structures in SQL Server 2000.
The Unique Identifier datatype in SQL Server has tremendous potential to solve many of the issues one finds with Identity fields, other primary keys, etc. However it also has some drawbacks and limitations. Author Sharad Nandwani looks at some of the pros and cons of this datatype.