title: Can AWS Redshift be used as a service?
body: <p>Is it possible to use Redshift as a service.
  My requirement is to give access to customer to their data? How I can restrict access at customer level? Customer Id will be available in each table.
  View can be used as an option but doesn't look practical.
  Do I need to create security group for each customer?  Any limitation of security group that I can have for a cluster? </p>