dcbbc497   
   From: esquel@sommarskog.se   
      
   soni kundani (soni.kundani@gmail.com) writes:   
   > I have the following table:   
   > TableName: WC   
   > Columns:   
   > UserID     PeriodOfEntry    LastName   
   > 1             06/02/2010        Apple   
   > 1             04/01/2009        Apple   
   > 2             04/12/2000        Peach   
   > 2             04/11/2000        Peach   
   > 2             06/02/2010        Peach   
   > 3             01/11/2000        Grape   
   >   
   > I'm trying to get it so the query will return a unique UserID with   
   > it's latest PeriodOfEntry only,   
      
   WITH numbered AS (   
      SELECT UserID, PeriodOfEntry, LastName,   
             rowno = row_number() OVER(PARTITION BY UserID   
                                       ORDER BY PeriofOfEntry DESC)   
      FROM  tbl   
   )   
   SELECT UserId, PeriodOfEntry, LastName   
   FROM   tbl   
   WHERE  rowno = 1   
      
   This solution requires SQL 2005 or alter. (Please always include which   
   version of SQL Server you use.)   
      
   The part that starts with WITH is a Common Table Expression, which   
   can be described as a temporary view, visible only for the query.   
   In the CTE we determine a row number which we then filter on.   
      
   --   
   Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se   
      
   Links for SQL Server Books Online:   
   SQL 2008: http://msdn.microsoft.com/en-us/sqlserver/cc514207.aspx   
   SQL 2005: http://msdn.microsoft.com/en-us/sqlserver/bb895970.aspx   
   SQL 2000: http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx   
      
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