title: Get column value from string column name sql
body: <p>Is this possible to get multiple columns value when we have column name as string 
  Like if i have a table <code>Test</code> and i have columns <code>FirstName , LastName , Address</code> .</p>
  
  <p>Now what i want to get value of all three columns but i want to make this dynamic so that i just pass string column name i get values for that columns</p>
  
  <p><strong>Example</strong></p>
  
  <pre><code>Select 
  
  (select column_name from metadata )
  
  from source table 
  </code></pre>