title: Retrieve Data from MySQL server within a time interval
body: <p>I've a table called <code>graphs</code> and it has my fields like: </p>
  
  <p><code>id, name, channel, created..</code> etc. <code>created</code> field is <code>DATETIME</code>.</p>
  
  <p>Now, I want to retrieve data with <code>one minute</code> time interval. That is, date difference with current time and <code>created</code> field will be <code>one minute</code>.</p>
  
  <p>Here <code>created</code> field date format is: <code>Y-m-d h:i:s</code>.</p>
  
  <p>What is the solution? Please help.</p>