If Column1 of Table1 has following values ‘CaseSearch, casesearch, CASESEARCH, CaSeSeArCh’, following statement will return you all the four records.
WHERE Column1 = 'casesearch'
To make the query case sensitive and retrieve only one record (“casesearch”) from above query, the collation of the query needs to be changed as follows.
WHERE Column1 COLLATE Latin1_General_CS_AS = 'casesearch'
Adding COLLATE Latin1_General_CS_AS makes the search case sensitive.
Default Collation of the SQL Server installation SQL_Latin1_General_CP1_CI_AS is not case sensitive.
To change the collation of the any column for any table permanently run following query.
ALTER TABLE Table1
ALTER COLUMN Column1 VARCHAR(20)
To know the collation of the column for any table run following Stored Procedure.
EXEC sp_help DatabaseName
Second results set above script will return you collation of database DatabaseName.
Reference : Pinal Dave (http://blog.SQLAuthority.com)