title: How do I query all rows within a 5-mile radius of my coordinates?
body: <p>Here's a sample of my PostgreSQL in CSV format.</p>
  
  <pre><code>row,latitude,longitude
  1,42.082513,-72.621498
  2,42.058588,-72.633386
  3,42.061118,-72.631541
  4,42.06035,-72.634145
  </code></pre>
  
  <p>I have thousands more rows like these spanning coordinates across the world. </p>
  
  <p>I want to query the table only for coordinates within a certain radius. How do I do this with PostGIS and PostgreSQL?</p>