title: Adding a auto incremental column into existing redshift table
body: <p>I have a table in Redshift.</p>
  
  <p>I want to add a column which should have incremental values. I dont want to drop the table and create a new one.</p>
  
  <p>Please suggest the command to add a column having auto incremental values in redshift table.</p>
  
  <p>Thanks !!!</p>