title: PostgreSQL update doesn't work
body: <p>I am working on a PostgreSQL 9.5.3 db which I haven't setup myself. The issue that I have is that a simple update of the form: <code>UPDATE &lt;table&gt; SET &lt;col&gt; = &lt;val&gt; WHERE &lt;col&gt; = &lt;old_val&gt;;</code> does not apply the change. I mention that the pgAdmin output is:</p>
  
  <blockquote>
    <p>UPDATE 1</p>
    
    <p>Query returned successfully in .. msec</p>
  </blockquote>
  
  <p>What could be the cause? Could it be explained by some set constraints?</p>
  
  <p>Thanks</p>