title: Allowing a subset of devices' data through
body: <p>I have a dynamic fleet of devices self-registering with IoT Hub and feeding data into Azure Stream Analytics - each device has a uniquely generated ID. I would like to be able to randomly pick 10 of them and output this filtered dataset to Power BI for visualisation purposes. I'm using streaming datasets.</p>
  
  <p>How do I go about constructing this subset...? <strong>WHERE deviceId LIKE</strong> isn't the right approach since the device ID is uniquely generated.</p>
  
  <p>Thanks!</p>