title: Select without a FROM clause in Oracle
body: <p>in <strong>SQL Server</strong> is possible to execute a SELECT, without reference to a table; something like:</p>
  
  <pre><code>Select 1.2 +3, 'my dummy string'
  </code></pre>
  
  <p>As <strong>Oracle</strong> does not allow a SELECT without a FROM, I use the dual table for this type of operation; something like:</p>
  
  <pre><code>Select 1,2+3, 'my dummy string' FROM DUAL
  </code></pre>
  
  <p>There is a better way of doing this type of query? it is good practice to use the dual table?</p>