title: Data from last 13 months
body: <p>I've a table in SQL Server 2008 database which has a column 'Month', nvarchar datatype, where the data is stored in the format 'Jan 2013', 'Feb 2013', 'Mar 2013' and so on till 'Mar 2014'. </p>
  
  <p>Now I want the data from Mar 2013 to Mar 2014 in my result but am not able to get that.</p>
  
  <p>Am trying this where clause : <strong>WHERE (Month > DATEADD(Month, DATEDIFF(year, 0, GETDATE()) - 13, 0))</strong> but it's giving me an error saying <strong>Conversion failed when converting date and/or time from character string.</strong></p>
  
  <p>I've also tried renaming the data as 'March 2014' and subsuquently for other entries as well, but it's not helping either.</p>
  
  <p>Dear SQL experts, please help!</p>