Why can't I specify both a Primary Key and a Unique Constraint on the same table?

Why can't I specify both a Primary Key and a Unique Constraint on the same table?

sql sql-server primary-key unique-constraint

sql-server

Best way of constructing dynamic sql queries in C#/.NET3.5?

c# sql sql-server linq .net-3.5

sql-server

What would be the best way to fetch around a million record from DB?

.net asp.net sql-server

sql-server

SQL Server 2008 Express Grant User Permission

sql-server permissions sql-server-express

sql-server

SQL Server : pivot functionality, need to pivot a table

sql sql-server subquery pivot correlated-subquery

sql-server

SQL text before the Nth match?

sql sql-server pattern-matching substring

sql-server

SQL Server Management Studio Schema View

sql-server sql-server-2008 ssms

sql-server

How to Short-Circuit SQL Where Clause

sql sql-server tsql

sql-server

SELECT TOP N with UNION and ORDER BY

sql-server tsql

sql-server

What do the different colored bars in the query editor menu mean in SSMS?

sql-server ssms

sql-server

Is it possible to return empty row from Sql Server?

sql sql-server sql-server-2005 sql-server-2008

sql-server

SQL Replace comma in results without using replace

sql sql-server

sql-server

Using bcp utility to export SQL queries to a text file

sql sql-server debugging sql-server-2005 bcp

sql-server

sql server giving error : is not a recognized function name

sql sql-server

sql-server

How to check SQL Server Performance Tuning for Stored Procedures [closed]

sql-server sql-server-2008

sql-server