title: created and modified timestamp in sql server 2008
body: <p>I am new to SQL and I want to create timestamp for createdtime and modifiedtime columns.
  and then compare createdtime with modifiedtime, if modifiedtime is greater than 10 minutes it will not let the row to be updated. 
  How can I achieve this?
  I am using sql server 2008 R2
  Thanks</p>