alicht/lifionchallenge

Vidsi challenge

1) ERD

2) SQL Query

SELECT videos.title,
FROM subscribers JOIN videos ON videos.id = streams.video_id
WHERE videos.timestamp >= "2017-01-01"
AND videos.timestamp < "2017-02-01"
GROUP BY videos.title
ORDER BY videos.title LIMIT 20

3) Algorithm

function cancelationNotice(invoices, subscribers){
  var accountsPastDue = subscribers.filter(function(subscriber, amountDue){
    return subscriber.invoices.amountDue > 0;
  })
  return accountsPastDue;
}