title: using single database file for multiple users
body: <p>I want to make a site in which every user has his own customers and products to manage.
  Whats the best way to handle this??</p>
  
  <p>Is it OK to use an additional field for each entry specifying the user this entry belongs to ? or there is a better way?</p>
  
  <p>Im using sql server if it matters.</p>
  
  <p>Thank You.</p>