title: Get Daily Active Users for the last 2 weeks
body: <p>I have a log on our app that logs all user activity along with a unix timestamp and I now want to create a function that will return the data needed to display the number of DAU each day in the last 2 weeks. Ive googled around a bit , but I have been unable to find a straightforward question on Stack regarding how to even start to go about such a query . Maybe my querying knowledge just is not advanced enough , excuse my ignorance if this is the case. I just have no idea how to group individual dates + unique user totals in a single query.</p>
  
  <p>my table is setup as following </p>
  
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  <h2>|LOG_ID | TYPE_OF_REQUEST | USER_ID | TSTAMP |</h2>