title: how to get a member with maximum (or minimum ) score from redis sorted set given a subset of members?
body: <p>I am writing a algo for deducing the user with the least amount of work load. Based on the type/complexity of the tasks being created, i narrow down on the list of the users that are capable of performing it. Now, I need to find the user who has the least number tasks currently assigned to him/her.
  I am using redis sorted set to store the members/users along the score indicating the number of the tasks assigned to them.
  Is there a way to get a member with least score given a subset of members?</p>