April 10, 2006 at 11:30 am
They both ensure that no duplicate values can be entered into a column (or set of columns), but there are differences in how they should be used. See UNIQUE Constraints in BOL.
April 11, 2006 at 8:26 am
Designating the column as Primary Key causes it to be used as the base lookup of any indexes that are applied to the table (by default it is also clustered, if you do not specify otherwise).
April 11, 2006 at 12:51 pm
Certain facilities (such as full text indexes) require there to be a primary key on a table.
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