Set or Change Column Collation

http://msdn.microsoft.com/en-us/library/ms190920.aspx

You can override the database collation for char, varchar, text, nchar, nvarchar, and ntext data by specifying a different collation for a specific column of a table and using one of the following:

The COLLATE clause of CREATE TABLE and ALTER TABLE. For example:

CREATE TABLE dbo.MyTable
  (PrimaryKey   int PRIMARY KEY,
   CharCol      varchar(10) COLLATE French_CI_AS NOT NULL
  );
GO
ALTER TABLE dbo.MyTable ALTER COLUMN CharCol
            varchar(10)COLLATE Latin1_General_CI_AS NOT NULL;
GO

You cannot change the collation of a column that is currently referenced by any one of the following:

A computed column
An index
Distribution statistics, either generated automatically or by the CREATE STATISTICS statement
A CHECK constraint
A FOREIGN KEY constraint

When you work with tempdb, the COLLATE clause includes a database_default option to specify that a column in a temporary table uses the collation default of the current user database for the connection instead of the collation of tempdb.

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