title: Lat/long columns into point column in PostGIS
body: <p>I have a simple postgres database with 4-5 columns including one latitude and one longitude column. I want to have an additional postGIS point column, but are at loss how I construct this new column using the two excisting latitude and longitude columns.</p>
  
  <pre><code>Table1
  a  |  b  |  c | latitude | longitude | location(point column)
  </code></pre>