title: Which is the Postgres version
body: <p>I have a doubt about my version of Postgres installed in my environment. </p>
  
  <p>This is my os: <code>CentOS Linux release 7.3.1611 (Core)</code>
  In <code>/usr/</code> I can see: <code>pgsql-9.4/</code> folder.</p>
  
  <p>But when I do: <code>select version();</code> I get: </p>
  
  <pre><code>PostgreSQL 9.2.18 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 4.8.5 
  20150623 (Red Hat 4.8.5-11), 64-bit
  </code></pre>
  
  <p>So, what version do I have?</p>