As we know SQL Server 2000, 2005, 2008 and 2008R2 doesn’t provide intellisense like Visual Studio by default. While writing SQL statements/queries, we need to recall the database table structure (including columns, their data types, size) and other database objects structure like stored procedure, view and functions again and again. Sometimes it becomes tedious task.
Also there is a common and still active issue that “The IntelliSense feature in SSMS 2008 R2 may stop working after you install Visual Studio 2010 SP1”
Until a good solution found for above problem we can use following external tools for Enabling Intelligence in SQL Server
 SQL Complete : http://www.devart.com/dbforge/sql/sqlcomplete/
 SQL Developer Bundle : http://www.red-gate.com/products/sql-development/sql-developer-bundle/
Hope it helps!